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[PATCH v8 0/6] use per-vma locks for /proc/pid/maps reads

by Suren Baghdasaryan

Reading /proc/pid/maps requires read-locking mmap_lock which prevents any other task from concurrently modifying the address space. This guarantees coherent reporting of virtual address ranges, however it can block important updates from happening. Oftentimes /proc/pid/maps readers are low priority monitoring tasks and them blocking high priority tasks results in priority inversion. Locking the entire address space is required to present fully coherent picture of the address space, however even current implementation does not strictly guarantee that by outputting vmas in page-size chunks and dropping mmap_lock in between each chunk. Address space modifications are possible while mmap_lock is dropped and userspace reading the content is expected to deal with possible concurrent address space modifications. Considering these relaxed rules, holding mmap_lock is not strictly needed as long as we can guarantee that a concurrently modified vma is reported either in its original form or after it was modified. This patchset switches from holding mmap_lock while reading /proc/pid/maps to taking per-vma locks as we walk the vma tree. This reduces the contention with tasks modifying the address space because they would have to contend for the same vma as opposed to the entire address space. Previous version of this patchset [1] tried to perform /proc/pid/maps reading under RCU, however its implementation is quite complex and the results are worse than the new version because it still relied on mmap_lock speculation which retries if any part of the address space gets modified. New implementaion is both simpler and results in less contention. Note that similar approach would not work for /proc/pid/smaps reading as it also walks the page table and that's not RCU-safe. Paul McKenney's designed a test [2] to measure mmap/munmap latencies while concurrently reading /proc/pid/maps. The test has a pair of processes scanning /proc/PID/maps, and another process unmapping and remapping 4K pages from a 128MB range of anonymous memory. At the end of each 10 second run, the latency of each mmap() or munmap() operation is measured, and for each run the maximum and mean latency is printed. The map/unmap process is started first, its PID is passed to the scanners, and then the map/unmap process waits until both scanners are running before starting its timed test. The scanners keep scanning until the specified /proc/PID/maps file disappears. The latest results from Paul: Stock mm-unstable, all of the runs had maximum latencies in excess of 0.5 milliseconds, and with 80% of the runs' latencies exceeding a full millisecond, and ranging up beyond 4 full milliseconds. In contrast, 99% of the runs with this patch series applied had maximum latencies of less than 0.5 milliseconds, with the single outlier at only 0.608 milliseconds. From a median-performance (as opposed to maximum-latency) viewpoint, this patch series also looks good, with stock mm weighing in at 11 microseconds and patch series at 6 microseconds, better than a 2x improvement. Before the change: ./run-proc-vs-map.sh --nsamples 100 --rawdata -- --busyduration 2 0.011 0.008 0.521 0.011 0.008 0.552 0.011 0.008 0.590 0.011 0.008 0.660 ... 0.011 0.015 2.987 0.011 0.015 3.038 0.011 0.016 3.431 0.011 0.016 4.707 After the change: ./run-proc-vs-map.sh --nsamples 100 --rawdata -- --busyduration 2 0.006 0.005 0.026 0.006 0.005 0.029 0.006 0.005 0.034 0.006 0.005 0.035 ... 0.006 0.006 0.421 0.006 0.006 0.423 0.006 0.006 0.439 0.006 0.006 0.608 The patchset also adds a number of tests to check for /proc/pid/maps data coherency. They are designed to detect any unexpected data tearing while performing some common address space modifications (vma split, resize and remap). Even before these changes, reading /proc/pid/maps might have inconsistent data because the file is read page-by-page with mmap_lock being dropped between the pages. An example of user-visible inconsistency can be that the same vma is printed twice: once before it was modified and then after the modifications. For example if vma was extended, it might be found and reported twice. What is not expected is to see a gap where there should have been a vma both before and after modification. This patchset increases the chances of such tearing, therefore it's even more important now to test for unexpected inconsistencies. In [3] Lorenzo identified the following possible vma merging/splitting scenarios: Merges with changes to existing vmas: 1 Merge both - mapping a vma over another one and between two vmas which can be merged after this replacement; 2. Merge left full - mapping a vma at the end of an existing one and completely over its right neighbor; 3. Merge left partial - mapping a vma at the end of an existing one and partially over its right neighbor; 4. Merge right full - mapping a vma before the start of an existing one and completely over its left neighbor; 5. Merge right partial - mapping a vma before the start of an existing one and partially over its left neighbor; Merges without changes to existing vmas: 6. Merge both - mapping a vma into a gap between two vmas which can be merged after the insertion; 7. Merge left - mapping a vma at the end of an existing one; 8. Merge right - mapping a vma before the start end of an existing one; Splits 9. Split with new vma at the lower address; 10. Split with new vma at the higher address; If such merges or splits happen concurrently with the /proc/maps reading we might report a vma twice, once before the modification and once after it is modified: Case 1 might report overwritten and previous vma along with the final merged vma; Case 2 might report previous and the final merged vma; Case 3 might cause us to retry once we detect the temporary gap caused by shrinking of the right neighbor; Case 4 might report overritten and the final merged vma; Case 5 might cause us to retry once we detect the temporary gap caused by shrinking of the left neighbor; Case 6 might report previous vma and the gap along with the final marged vma; Case 7 might report previous and the final merged vma; Case 8 might report the original gap and the final merged vma covering the gap; Case 9 might cause us to retry once we detect the temporary gap caused by shrinking of the original vma at the vma start; Case 10 might cause us to retry once we detect the temporary gap caused by shrinking of the original vma at the vma end; In all these cases the retry mechanism prevents us from reporting possible temporary gaps. Changes since v7 [4]: - Refactored tests to use kselftest harness, per David Hildenbrand and Lorenzo Stoakes - Removed PROCMAP_QUERY selftest, per David Hildenbrand and Lorenzo Stoakes - Added Acked-by, per David Hildenbrand - Replaced sentinels values with named definitions, per Vlastimil Babka - Added Reviewed-by, per Vlastimil Babka !!! NOTES FOR APPLYING THE PATCHSET !!! Applies cleanly over mm-unstable after reverting v7 version of this patchset (from 94951ab6fe6f to e47914e6c28f in mm-unstable). [1] https://lore.kernel.org/all/20250418174959.1431962-1-surenb@google.com/ [2] https://github.com/paulmckrcu/proc-mmap_sem-test [3] https://lore.kernel.org/all/e1863f40-39ab-4e5b-984a-c48765ffde1c@lucifer.lo… [4] https://lore.kernel.org/all/20250716030557.1547501-1-surenb@google.com/ Suren Baghdasaryan (6): selftests/proc: add /proc/pid/maps tearing from vma split test selftests/proc: extend /proc/pid/maps tearing test to include vma resizing selftests/proc: extend /proc/pid/maps tearing test to include vma remapping selftests/proc: add verbose mode for /proc/pid/maps tearing tests fs/proc/task_mmu: remove conversion of seq_file position to unsigned fs/proc/task_mmu: read proc/pid/maps under per-vma lock fs/proc/internal.h | 5 + fs/proc/task_mmu.c | 158 +++- include/linux/mmap_lock.h | 11 + mm/madvise.c | 3 +- mm/mmap_lock.c | 93 +++ tools/testing/selftests/proc/.gitignore | 1 + tools/testing/selftests/proc/Makefile | 1 + tools/testing/selftests/proc/proc-maps-race.c | 741 ++++++++++++++++++ 8 files changed, 997 insertions(+), 16 deletions(-) create mode 100644 tools/testing/selftests/proc/proc-maps-race.c -- 2.50.0.727.gbf7dc18ff4-goog

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Start Campaign Outreach with Fresh Data from GSX 2025

by Ben Graham

Hi , Interested in getting the GSX 2025 attendee list? Expo Name: Global Security Exchange (GSX) 2025 Total Number of records: 17,000 records List includes: Company Name, Contact Name, Job Title, Mailing Address, Phone, Emails, etc. Are you considering buying these leads? If yes, I can send you the pricing information. Awaiting your message Regards Ben Graham Demand Generation Manager US Marketing Data Inc., Please reply with REMOVE if you don't wish to receive further emails

5 months

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[PATCH 0/7] Replace "__auto_type" with "auto"

by H. Peter Anvin

"auto" was defined as a keyword back in the K&R days, but as a storage type specifier. No one ever used it, since it was and is the default storage type for local variables. C++11 recycled the keyword to allow a type to be declared based on the type of an initializer. This was finally adopted into standard C in C23. gcc and clang provide the "__auto_type" alias keyword as an extension for pre-C23, however, there is no reason to pollute the bulk of the source base with this temporary keyword; instead define "auto" as a macro unless the compiler is running in C23+ mode. This macro is added in <linux/compiler_types.h> because that header is included in some of the tools headers, wheres <linux/compiler.h> is not as it has a bunch of very kernel-specific things in it. --- arch/nios2/include/asm/uaccess.h | 4 ++-- arch/x86/include/asm/bug.h | 2 +- arch/x86/include/asm/string_64.h | 6 +++--- arch/x86/include/asm/uaccess_64.h | 2 +- fs/proc/inode.c | 16 ++++++++-------- include/linux/cleanup.h | 4 ++-- include/linux/compiler.h | 2 +- include/linux/compiler_types.h | 13 +++++++++++++ include/linux/minmax.h | 6 +++--- tools/testing/selftests/bpf/prog_tests/socket_helpers.h | 9 +++++++-- tools/virtio/linux/compiler.h | 2 +- 11 files changed, 42 insertions(+), 24 deletions(-)

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[PATCH RFC 0/3] selftests/landlock: scoping abstractions

by Abhinav Saxena

Hi all, I was starting to work on the memfd-exec[1] feature and observed that Landlock's scoped-IPC features (abstract UNIX sockets and signals) follow a consistent high-level model, which I'm calling a resource-accessor pattern: Resource Process <-> Accessor Process - Resource process: owns or manages the asset - socket creator (bind/accept) - signal handler - memfd creator - Accessor process: attempts to use the asset - socket client (connect/sendto) - signal sender - memfd executor RESOURCE-ACCESSOR PATTERN FUNDAMENTALS ====================================== This pattern appears fundamental to Landlock scoping because: 1. Consistent enforcement model: Landlock restrictions are enforced only on the accessor side; the resource side remains unconstrained across all scope types. 2. Reflects actual security boundaries: In practice, sandboxed processes typically need to access resources created by other processes, not the reverse. 3. Scalable design: This model works consistently whether processes are in parent-child relationships or independent peer domains. 4. Real-world usage patterns: Container runtimes and sandbox orchestrators routinely start multiple workers that restrict themselves independently. CURRENT TEST COVERAGE GAP ========================= Existing self-tests cover hierarchical resource <-> accessor pairs but do not exercise the case where each task enters an independent domain. While 'sibling_domain' tests exist, they still use parent-child relationship patterns rather than true peer domains. Current Coverage (Linear Hierarchies Only): ------------------------------------------- Type 1: Parent-Child (scoped_domains) P1 ---- P2 Type 2: Three Generations (scoped_vs_unscoped) P1 ---- P2 ---- P3 Variations tested for both types: - No domains - Various scoped domain combinations - Nested domains within inherited domains - Mixed domain types (SCOPE vs OTHER vs NONE) Missing Coverage (True Sibling Scenarios): ------------------------------------------ Root | +-- Child A [various domain types] | +-- Child B [various domain types] Missing test scenarios: - A <-> B cross-sibling communication - Mixed sibling domain combinations - Sibling isolation enforcement - Parent -> A, Parent -> B differential access SOLUTION ======== This series implements the missing sibling pattern using the resource-accessor model. The tests create a fork tree that looks like this: coordinator (no domain) | +-- resource_proc (Domain X) /* owns the resource */ | +-- accessor_proc (Domain Y) /* tries to access */ This directly addresses the missing coverage by creating two independent child processes that establish peer domains, rather than the hierarchical parent-child domains covered by existing tests. Both children call landlock_restrict_self() for the first time, so their struct landlock_domain->parent pointers are NULL, creating true peer domains. The harness exposes four test variants: Variant name | Resource domain | Accessor domain | Result -------------------|-----------------|-----------------|---------- none_to_none | none | none | ALLOW none_to_scoped | none | scoped | DENY scoped_to_none | scoped | none | ALLOW scoped_to_scoped | scoped | scoped (peer) | DENY The scoped_to_scoped case was missing from current coverage. TESTING ======= All patches apply cleanly to v6.14-rc2 and pass on landlock/master. The helpers are small and re-use the existing kselftest_harness.h fixture/variant pattern. All patches have been validated with scripts/checkpatch.pl --strict and show no warnings. This series introduces **no kernel changes**, only selftests additions. Feedback very welcome. Thanks, Abhinav [1] https://github.com/landlock-lsm/linux/issues/37 Links: - Landlock documentation: https://docs.kernel.org/userspace-api/landlock.html - Landlock LSM kernel docs: https://docs.kernel.org/security/landlock.html - Existing tests: tools/testing/selftests/landlock/scoped_* Signed-off-by: Abhinav Saxena <xandfury(a)gmail.com> --- Abhinav Saxena (3): selftests/landlock: move sandbox_type to common selftests/landlock: add cross-domain variants selftests/landlock: add cross-domain signal tests tools/testing/selftests/landlock/scoped_common.h | 7 + .../landlock/scoped_cross_domain_variants.h | 54 +++++ .../landlock/scoped_multiple_domain_variants.h | 7 - .../selftests/landlock/scoped_signal_test.c | 237 +++++++++++++++++++++ 4 files changed, 298 insertions(+), 7 deletions(-) --- base-commit: 5b74b2eff1eeefe43584e5b7b348c8cd3b723d38 change-id: 20250715-landlock_abstractions-dbc0aabf1063 Best regards, -- Abhinav Saxena <xandfury(a)gmail.com>

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[PATCH v13 net-next 00/14] AccECN protocol patch series

by chia-yu.chang＠nokia-bell-labs.com

From: Chia-Yu Chang <chia-yu.chang(a)nokia-bell-labs.com> Hello, Please find the v10 AccECN protocol patch series, which covers the core functionality of Accurate ECN, AccECN negotiation, AccECN TCP options, and AccECN failure handling. The Accurate ECN draft can be found in https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-28 This patch series is part of the full AccECN patch series, which is available at https://github.com/L4STeam/linux-net-next/commits/upstream_l4steam/ Best Regards, Chia-Yu --- v13 (18-Jul-2025) - Implement tcp_accecn_extract_syn_ect() and tcp_accecn_reflector_flags() with static array lookup of patch #6 (Paolo Abeni <pabeni(a)redhat.com>) - Fix typos in comments of #6 and remove patch #7 of v12 about simulatenous connect (Paolo Abeni <pabeni(a)redhat.com>) - Move TCP_ACCECN_E1B_INIT_OFFSET, TCP_ACCECN_E0B_INIT_OFFSET, and TCP_ACCECN_CEB_INIT_OFFSET from patch #7 to #11 (Paolo Abeni <pabeni(a)redhat.com>) - Use static array lookup in tcp_accecn_optfield_to_ecnfield() of patch #11 (Paolo Abeni <pabeni(a)redhat.com>) - Return false when WARN_ON_ONCE() is true in tcp_accecn_process_option() of patch #11 (Paolo Abeni <pabeni(a)redhat.com>) - Make synack_ecn_bytes as static const array and use const u32 pointer in tcp_options_write() of #11 (Paolo Abeni <pabeni(a)redhat.com>) - Use ALIGN() and ALIGN_DOWN() in tcp_options_fit_accecn() to pad TCP AccECN option to dword of #11 (Paolo Abeni <pabeni(a)redhat.com>) - Return TCP_ACCECN_OPT_FAIL_SEEN if WARN_ON_ONCE() is true in tcp_accecn_option_init() of #12 (Paolo Abeni <pabeni(a)redhat.com>) v12 (04-Jul-2025) - Fix compilation issues with some intermediate patches in v11 - Add more comments for AccECN helpers of tcp_ecn.h v11 (03-Jul-2025) - Fix compilation issues with some intermediate patches in v10 v10 (02-Jul-2025) - Add new patch of separated header file include/net/tcp_ecn.h to include ECN and AccECN functions (Eric Dumazet <edumazet(a)google.com>) - Add comments on the AccECN helper functions in tcp_ecn.h (Eric Dumazet <edumazet(a)google.com>) - Add documentation of tcp_ecn, tcp_ecn_option, tcp_ecn_beacon in ip-sysctl.rst to the corresponding patch (Eric Dumazet <edumazet(a)google.com>) - Split wait third ACK functionality into a separated patch from AccECN negotiation patch (Eric Dumazet <edumazet(a)google.com>) - Add READ_ONCE() over every reads of sysctl for all patches in the series (Eric Dumazet <edumazet(a)google.com>) - Merge heuristics of AccECN option ceb/cep and ACE field multi-wrap into a single patch - Add a table of SACK block reduction and required AccECN field in patch #15 commit message (Eric Dumazet <edumazet(a)google.com>) v9 (21-Jun-2025) - Use tcp_data_ecn_check() to set TCP_ECN_SEE flag only for RFC3168 ECN (Paolo Abeni <pabeni(a)redhat.com>) - Add comments about setting TCP_ECN_SEEN flag for RFC3168 and Accruate ECN (Paolo Abeni <pabeni(a)redhat.com>) - Restruct the code in the for loop of tcp_accecn_process_option() (Paolo Abeni <pabeni(a)redhat.com>) - Remove ecn_bytes and add use_synack_ecn_bytes flag to identify whether syn_ack_bytes or received_ecn_bytes is used (Paolo Abeni <pabeni(a)redhat.com>) - Replace leftover_bytes and leftover_size with leftover_highbyte and leftover_lowbyte and add comments in tcp_options_write() (Paolo Abeni <pabeni(a)redhat.com>) - Add comments and commit message about the 1st retx SYN still attempt AccECN negotiation (Paolo Abeni <pabeni(a)redhat.com>) v8 (10-Jun-2025) - Add new helper function tcp_ecn_received_counters_payload() in #6 (Paolo Abeni <pabeni(a)redhat.com>) - Set opts->num_sack_blocks=0 to avoid potential undefined value in #8 (Paolo Abeni <pabeni(a)redhat.com>) - Reset leftover_size to 2 once leftover_bytes is used in #9 (Paolo Abeni <pabeni(a)redhat.com>) - Add new helper function tcp_accecn_opt_demand_min() in #10 (Paolo Abeni <pabeni(a)redhat.com>) - Add new helper function tcp_accecn_saw_opt_fail_recv() in #11 (Paolo Abeni <pabeni(a)redhat.com>) - Update tcp_options_fit_accecn() to avoid using recursion in #14 (Paolo Abeni <pabeni(a)redhat.com>) v7 (14-May-2025) - Modify group sizes of tcp_sock_write_txrx and tcp_sock_write_rx in #3 based on pahole results (Paolo Abeni <pabeni(a)redhat.com>) - Fix the issue in #4 and #5 where the RFC3168 ECN behavior in tcp_ecn_send() is changed (Paolo Abeni <pabeni(a)redhat.com>) - Modify group size of tcp_sock_write_txrx in #4 and #6 based on pahole results (Paolo Abeni <pabeni(a)redhat.com>) - Update commit message for #9 to explain the increase in tcp_sock_write_rx group size - Modify group size of tcp_sock_write_tx in #10 based on pahole results v6 (09-May-2025) - Add #3 to utilize exisintg holes of tcp_sock_write_txrx group for later patches (#4, #9, #10) with new u8 members (Paolo Abeni <pabeni(a)redhat.com>) - Add pahole outcomes before and after commit in #4, #5, #6, #9, #10, #15 (Paolo Abeni <pabeni(a)redhat.com>) - Define new helper function tcp_send_ack_reflect_ect() for sending ACK with reflected ECT in #5 (Paolo Abeni <pabeni(a)redhat.com>) - Add comments for function tcp_ecn_rcv_synack() in #5 (Paolo Abeni <pabeni(a)redhat.com>) - Add enum/define to be used by sysctl_tcp_ecn in #5, sysctl_tcp_ecn_option in #9, and sysctl_tcp_ecn_option_beacon in #10 (Paolo Abeni <pabeni(a)redhat.com>) - Move accecn_fail_mode and saw_accecn_opt in #5 and #11 to use exisintg holes of tcp_sock (Paolo Abeni <pabeni(a)redhat.com>) - Change data type of new members of tcp_request_sock and move them to the end of struct in #5 and #11 (Paolo Abeni <pabeni(a)redhat.com>) - Move new members of tcp_info to the end of struct in #6 (Paolo Abeni <pabeni(a)redhat.com>) - Merge previous #7 into #9 (Paolo Abeni <pabeni(a)redhat.com>) - Mask ecnfield with INET_ECN_MASK to remove WARN_ONCE in #9 (Paolo Abeni <pabeni(a)redhat.com>) - Reduce the indentation levels for reabability in #9 and #10 (Paolo Abeni <pabeni(a)redhat.com>) - Move delivered_ecn_bytes to the RX group in #9, accecn_opt_tstamp to the TX group in #10, pkts_acked_ewma to the RX group in #15 (Paolo Abeni <pabeni(a)redhat.com>) - Add changes in Documentation/networking/net_cachelines/tcp_sock.rst for new tcp_sock members in #3, #5, #6, #9, #10, #15 v5 (22-Apr-2025) - Further fix for 32-bit ARM alignment in tcp.c (Simon Horman <horms(a)kernel.org>) v4 (18-Apr-2025) - Fix 32-bit ARM assertion for alignment requirement (Simon Horman <horms(a)kernel.org>) v3 (14-Apr-2025) - Fix patch apply issue in v2 (Jakub Kicinski <kuba(a)kernel.org>) v2 (18-Mar-2025) - Add one missing patch from the previous AccECN protocol preparation patch series to this patch series. --- Chia-Yu Chang (5): tcp: reorganize tcp_sock_write_txrx group for variables later tcp: ecn functions in separated include file tcp: accecn: AccECN option send control tcp: accecn: AccECN option failure handling tcp: accecn: try to fit AccECN option with SACK Ilpo Järvinen (9): tcp: reorganize SYN ECN code tcp: fast path functions later tcp: AccECN core tcp: accecn: AccECN negotiation tcp: accecn: add AccECN rx byte counters tcp: accecn: AccECN needs to know delivered bytes tcp: sack option handling improvements tcp: accecn: AccECN option tcp: accecn: AccECN option ceb/cep and ACE field multi-wrap heuristics Documentation/networking/ip-sysctl.rst | 55 +- .../networking/net_cachelines/tcp_sock.rst | 12 + include/linux/tcp.h | 32 +- include/net/netns/ipv4.h | 2 + include/net/tcp.h | 87 ++- include/net/tcp_ecn.h | 649 ++++++++++++++++++ include/uapi/linux/tcp.h | 7 + net/ipv4/syncookies.c | 4 + net/ipv4/sysctl_net_ipv4.c | 19 + net/ipv4/tcp.c | 28 +- net/ipv4/tcp_input.c | 353 ++++++++-- net/ipv4/tcp_ipv4.c | 8 +- net/ipv4/tcp_minisocks.c | 40 +- net/ipv4/tcp_output.c | 294 ++++++-- net/ipv6/syncookies.c | 2 + net/ipv6/tcp_ipv6.c | 1 + 16 files changed, 1409 insertions(+), 184 deletions(-) create mode 100644 include/net/tcp_ecn.h -- 2.34.1

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[PATCH v24 net-next 0/6] DUALPI2 patch

by chia-yu.chang＠nokia-bell-labs.com

From: Chia-Yu Chang <chia-yu.chang(a)nokia-bell-labs.com> Hello, Please find the DualPI2 patch v24. This patch serise adds DualPI Improved with a Square (DualPI2) with following features: * Supports congestion controls that comply with the Prague requirements in RFC9331 (e.g. TCP-Prague) * Coupled dual-queue that separates the L4S traffic in a low latency queue (L-queue), without harming remaining traffic that is scheduled in classic queue (C-queue) due to congestion-coupling using PI2 as defined in RFC9332 * Configurable overload strategies * Use of sojourn time to reliably estimate queue delay * Supports ECN L4S-identifier (IP.ECN==0b*1) to classify traffic into respective queues For more details of DualPI2, please refer IETF RFC9332 (https://datatracker.ietf.org/doc/html/rfc9332). Best regards, Chia-Yu --- v24 (18-Jul-2025) - Replace TCA_DUALPI2 prefix with TC_DUALPI2 for enums in pkt_sched.h (Jakub Kicinski <kuba(a)kernel.org>) - Report error if both packet and time step thresholds are provided (Jakub Kicinski <kuba(a)kernel.org>) v23 (13-Jul-2025) and v22 (11-Jul-2025) - Fix issue when user would like to change DualPI2 but provides an empty TCA_OPTIONS with no nested attributes (Paolo Abeni <pabeni(a)redhat.com>, Jakub Kicinski <kuba(a)kernel.org>) v21 (02-Jul-2025) - Replace STEP_THRESH and STEP_PACKETS with STEP_THRESH_PKTS and STEP_THRESH_US (Jakub Kicinski <kuba(a)kernel.org>) - Move READ_ONCE and WRITE_ONCE to later DualPI2 patches (Jakub Kicinski <kuba(a)kernel.org>) - Replace NLA_POLICY_FULL_RANGE with NLA_POLICY_RANGE (Jakub Kicinski <kuba(a)kernel.org>) - Set extra error message for dualpi2_change (Jakub Kicinski <kuba(a)kernel.org>) - Drop redundant else for better readability (Paolo Abeni <pabeni(a)redhat.com>) - Replace step-thresh and step-packets with step-thresh-pkts and step-thresh-us (Jakub Kicinski <kuba(a)kernel.org>) - Remove redundant name-prefix and simplify entries of dualpi2 enums (Jakub Kicinski <kuba(a)kernel.org>) - Fix some typos and format issues of dualpi2 attributes v20 (21-Jun-2025) - Add one more commit to fix warning and style check on tdc.sh reported by shellcheck - Remove double-prefixed of "tc_tc_dualpi2_attrs" in tc-user.h (Donald Hunter <donald.hunter(a)gmail.com>) v19 (14-Jun-2025) - Fix one typo in the comment of #1 (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) - Update commit message of #4 (ALOK TIWARI <alok.a.tiwari(a)oracle.com>) - Wrap long lines of Documentation/netlink/specs/tc.yaml to within 80 characters (Jakub Kicinski <kuba(a)kernel.org>) v18 (13-Jun-2025) - Add the num of enum used by DualPI2 and fix name and name-prefix of DualPI2 enum and attribute - Replace from_timer() with timer_container_of() (Pedro Tammela <pctammela(a)mojatatu.com>) v17 (25-May-2025, Resent at 11-Jun-2025) - Replace 0xffffffff with U32_MAX (Paolo Abeni <pabeni(a)redhat.com>) - Use helper function qdisc_dequeue_internal() and add new helper function skb_apply_step() (Paolo Abeni <pabeni(a)redhat.com>) - Add s64 casting when calculating the delta of the PI controller (Paolo Abeni <pabeni(a)redhat.com>) - Change the drop reason into SKB_DROP_REASON_QDISC_CONGESTED for drop_early (Paolo Abeni <pabeni(a)redhat.com>) - Modify the condition to remove the original skb when enqueuing multiple GSO segments (Paolo Abeni <pabeni(a)redhat.com>) - Add READ_ONCE() in dualpi2_dump_stat() (Paolo Abeni <pabeni(a)redhat.com>) - Add comments, brackets, and brackets for readability (Paolo Abeni <pabeni(a)redhat.com>) v16 (16-MAy-2025) - Add qdisc_lock() to dualpi2_timer() in dualpi2_timer (Paolo Abeni <pabeni(a)redhat.com>) - Introduce convert_ns_to_usec() to convert usec to nsec without overflow in #1 (Paolo Abeni <pabeni(a)redhat.com>) - Update convert_us_tonsec() to convert nsec to usec without overflow in #2 (Paolo Abeni <pabeni(a)redhat.com>) - Add more descriptions with respect to DualPI2 in the cover ltter and add changelog in each patch (Paolo Abeni <pabeni(a)redhat.com>) v15 (09-May-2025) - Add enum of TCA_DUALPI2_ECN_MASK_CLA_ECT to remove potential leakeage in #1 (Simon Horman <horms(a)kernel.org>) - Fix one typo in comment of #2 - Update tc.yaml in #5 to aligh with the updated enum of pkt_sched.h v14 (05-May-2025) - Modify tc.yaml: (1) Replace flags with enum and remove enum-as-flags, (2) Remove credit-queue in xstats, and (3) Change attribute types (Donald Hunter <donald.hun - Add enum and fix the ordering of variables in pkt_sched.h to align with the modified tc.yaml (Donald Hunter <donald.hunter(a)gmail.com>) - Add validators for DROP_OVERLOAD, DROP_EARLY, ECN_MASK, and SPLIT_GSO in sch_dualpi2.c (Donald Hunter <donald.hunter(a)gmail.com>) - Update dualpi2.json to align with the updated variable order in pkt_sched.h - Reorder patches (Donald Hunter <donald.hunter(a)gmail.com>) v13 (26-Apr-2025) - Use dashes in member names to follow YNL conventions in tc.yaml (Donald Hunter <donald.hunter(a)gmail.com>) - Define enumerations separately for flags of drop-early, drop-overload, ecn-mask, credit-queue in tc.yaml (Donald Hunter <donald.hunter(a)gmail.com>) - Change the types of split-gso and step-packets into flag in tc.yaml (Donald Hunter <donald.hunter(a)gmail.com>) - Revert to u32/u8 types for tc-dualpi2-xstats members in tc.yaml (Donald Hunter <donald.hunter(a)gmail.com>) - Add new test cases in tc-tests/qdiscs/dualpi2.json to cover all dualpi2 parameters (Donald Hunter <donald.hunter(a)gmail.com>) - Change the type of TCA_DUALPI2_STEP_PACKETS into NLA_FLAG (Donald Hunter <donald.hunter(a)gmail.com>) v12 (22-Apr-2025) - Remove anonymous struct in sch_dualpi2.c (Paolo Abeni <pabeni(a)redhat.com>) - Replace u32/u8 with uint and s32 with int in tc spec document (Paolo Abeni <pabeni(a)redhat.com>) - Introduce get_memory_limit function to handle potential overflow when multipling limit with MTU (Paolo Abeni <pabeni(a)redhat.com>) - Double the packet length to further include packet overhead in memory_limit (Paolo Abeni <pabeni(a)redhat.com>) - Remove the check of qdisc_qlen(sch) when calling qdisc_tree_reduce_backlog (Paolo Abeni <pabeni(a)redhat.com>) v11 (15-Apr-2025) - Replace hstimer_init with hstimer_setup in sch_dualpi2.c v10 (25-Mar-2025) - Remove leftover include in include/linux/netdevice.h and anonymous struct in sch_dualpi2.c (Paolo Abeni <pabeni(a)redhat.com>) - Use kfree_skb_reason() and add SKB_DROP_REASON_DUALPI2_STEP_DROP drop reason (Paolo Abeni <pabeni(a)redhat.com>) - Split sch_dualpi2.c into 3 patches (and overall 5 patches): Struct definition & parsing, Dump stats & configuration, Enqueue/Dequeue (Paolo Abeni <pabeni(a)redhat.com>) v9 (16-Mar-2025) - Fix mem_usage error in previous version - Add min_qlen_step to the dualpi2 attribute as the minimum queue length in number of packets in the L-queue to start step threshold marking. In previous versions, this value was fixed to 2, so the step threshold was applied to mark packets in the L queue only when the queue length of the L queue was greater than or equal to 2 packets. This will cause larger queuing delays for L4S traffic at low rates (<20Mbps). So we parameterize it and change the default value to 0. Comparison of tcp_1down run 'HTB 20Mbit + DUALPI2 + 10ms base delay' Old versions: avg median # data pts Ping (ms) ICMP : 11.55 11.70 ms 350 TCP upload avg : 18.96 N/A Mbits/s 350 TCP upload sum : 18.96 N/A Mbits/s 350 New version (v9): avg median # data pts Ping (ms) ICMP : 10.81 10.70 ms 350 TCP upload avg : 18.91 N/A Mbits/s 350 TCP upload sum : 18.91 N/A Mbits/s 350 Comparison of tcp_1down run 'HTB 10Mbit + DUALPI2 + 10ms base delay' Old versions: avg median # data pts Ping (ms) ICMP : 12.61 12.80 ms 350 TCP upload avg : 9.48 N/A Mbits/s 350 TCP upload sum : 9.48 N/A Mbits/s 350 New version (v9): avg median # data pts Ping (ms) ICMP : 11.06 10.80 ms 350 TCP upload avg : 9.43 N/A Mbits/s 350 TCP upload sum : 9.43 N/A Mbits/s 350 Comparison of tcp_1down run 'HTB 10Mbit + DUALPI2 + 10ms base delay' Old versions: avg median # data pts Ping (ms) ICMP : 40.86 37.45 ms 350 TCP upload avg : 0.88 N/A Mbits/s 350 TCP upload sum : 0.88 N/A Mbits/s 350 TCP upload::1 : 0.88 0.97 Mbits/s 350 New version (v9): avg median # data pts Ping (ms) ICMP : 11.07 10.40 ms 350 TCP upload avg : 0.55 N/A Mbits/s 350 TCP upload sum : 0.55 N/A Mbits/s 350 TCP upload::1 : 0.55 0.59 Mbits/s 350 v8 (11-Mar-2025) - Fix warning messages in v7 v7 (07-Mar-2025) - Separate into 3 patches to avoid mixing changes of documentation, selftest, and code. (Cong Wang <xiyou.wangcong(a)gmail.com>) v6 (04-Mar-2025) - Add modprobe for dulapi2 in tc-testing script tc-testing/tdc.sh (Jakub Kicinski <kuba(a)kernel.org>) - Update test cases in dualpi2.json - Update commit message v5 (22-Feb-2025) - A comparison was done between MQ + DUALPI2, MQ + FQ_PIE, MQ + FQ_CODEL: Unshaped 1gigE with 4 download streams test: - Summary of tcp_4down run 'MQ + FQ_CODEL': avg median # data pts Ping (ms) ICMP : 1.19 1.34 ms 349 TCP download avg : 235.42 N/A Mbits/s 349 TCP download sum : 941.68 N/A Mbits/s 349 TCP download::1 : 235.19 235.39 Mbits/s 349 TCP download::2 : 235.03 235.35 Mbits/s 349 TCP download::3 : 236.89 235.44 Mbits/s 349 TCP download::4 : 234.57 235.19 Mbits/s 349 - Summary of tcp_4down run 'MQ + FQ_PIE' avg median # data pts Ping (ms) ICMP : 1.21 1.37 ms 350 TCP download avg : 235.42 N/A Mbits/s 350 TCP download sum : 941.61 N/A Mbits/s 350 TCP download::1 : 232.54 233.13 Mbits/s 350 TCP download::2 : 232.52 232.80 Mbits/s 350 TCP download::3 : 233.14 233.78 Mbits/s 350 TCP download::4 : 243.41 241.48 Mbits/s 350 - Summary of tcp_4down run 'MQ + DUALPI2' avg median # data pts Ping (ms) ICMP : 1.19 1.34 ms 349 TCP download avg : 235.42 N/A Mbits/s 349 TCP download sum : 941.68 N/A Mbits/s 349 TCP download::1 : 235.19 235.39 Mbits/s 349 TCP download::2 : 235.03 235.35 Mbits/s 349 TCP download::3 : 236.89 235.44 Mbits/s 349 TCP download::4 : 234.57 235.19 Mbits/s 349 Unshaped 1gigE with 128 download streams test: - Summary of tcp_128down run 'MQ + FQ_CODEL': avg median # data pts Ping (ms) ICMP : 1.88 1.86 ms 350 TCP download avg : 7.39 N/A Mbits/s 350 TCP download sum : 946.47 N/A Mbits/s 350 - Summary of tcp_128down run 'MQ + FQ_PIE': avg median # data pts Ping (ms) ICMP : 1.88 1.86 ms 350 TCP download avg : 7.39 N/A Mbits/s 350 TCP download sum : 946.47 N/A Mbits/s 350 - Summary of tcp_128down run 'MQ + DUALPI2': avg median # data pts Ping (ms) ICMP : 1.88 1.86 ms 350 TCP download avg : 7.39 N/A Mbits/s 350 TCP download sum : 946.47 N/A Mbits/s 350 Unshaped 10gigE with 4 download streams test: - Summary of tcp_4down run 'MQ + FQ_CODEL': avg median # data pts Ping (ms) ICMP : 0.22 0.23 ms 350 TCP download avg : 2354.08 N/A Mbits/s 350 TCP download sum : 9416.31 N/A Mbits/s 350 TCP download::1 : 2353.65 2352.81 Mbits/s 350 TCP download::2 : 2354.54 2354.21 Mbits/s 350 TCP download::3 : 2353.56 2353.78 Mbits/s 350 TCP download::4 : 2354.56 2354.45 Mbits/s 350 - Summary of tcp_4down run 'MQ + FQ_PIE': avg median # data pts Ping (ms) ICMP : 0.20 0.19 ms 350 TCP download avg : 2354.76 N/A Mbits/s 350 TCP download sum : 9419.04 N/A Mbits/s 350 TCP download::1 : 2354.77 2353.89 Mbits/s 350 TCP download::2 : 2353.41 2354.29 Mbits/s 350 TCP download::3 : 2356.18 2354.19 Mbits/s 350 TCP download::4 : 2354.68 2353.15 Mbits/s 350 - Summary of tcp_4down run 'MQ + DUALPI2': avg median # data pts Ping (ms) ICMP : 0.24 0.24 ms 350 TCP download avg : 2354.11 N/A Mbits/s 350 TCP download sum : 9416.43 N/A Mbits/s 350 TCP download::1 : 2354.75 2353.93 Mbits/s 350 TCP download::2 : 2353.15 2353.75 Mbits/s 350 TCP download::3 : 2353.49 2353.72 Mbits/s 350 TCP download::4 : 2355.04 2353.73 Mbits/s 350 Unshaped 10gigE with 128 download streams test: - Summary of tcp_128down run 'MQ + FQ_CODEL': avg median # data pts Ping (ms) ICMP : 7.57 8.69 ms 350 TCP download avg : 73.97 N/A Mbits/s 350 TCP download sum : 9467.82 N/A Mbits/s 350 - Summary of tcp_128down run 'MQ + FQ_PIE': avg median # data pts Ping (ms) ICMP : 7.82 8.91 ms 350 TCP download avg : 73.97 N/A Mbits/s 350 TCP download sum : 9468.42 N/A Mbits/s 350 - Summary of tcp_128down run 'MQ + DUALPI2': avg median # data pts Ping (ms) ICMP : 6.87 7.93 ms 350 TCP download avg : 73.95 N/A Mbits/s 350 TCP download sum : 9465.87 N/A Mbits/s 350 From the results shown above, we see small differences between combinations. - Update commit message to include results of no_split_gso and split_gso (Dave Taht <dave.taht(a)gmail.com> and Paolo Abeni <pabeni(a)redhat.com>) - Add memlimit in the dualpi2 attribute, and add memory_used, max_memory_used, memory_limit in dualpi2 stats (Dave Taht <dave.taht(a)gmail.com>) - Update note in sch_dualpi2.c related to BBRv3 status (Dave Taht <dave.taht(a)gmail.com>) - Update license identifier (Dave Taht <dave.taht(a)gmail.com>) - Add selftest in tools/testing/selftests/tc-testing (Cong Wang <xiyou.wangcong(a)gmail.com>) - Use netlink policies for parameter checks (Jamal Hadi Salim <jhs(a)mojatatu.com>) - Modify texts & fix typos in Documentation/netlink/specs/tc.yaml (Dave Taht <dave.taht(a)gmail.com>) - Add descriptions of packet counter statistics and the reset function of sch_dualpi2.c - Fix step_thresh in packets - Update code comments in sch_dualpi2.c v4 (22-Oct-2024) - Update statement in Kconfig for DualPI2 (Stephen Hemminger <stephen(a)networkplumber.org>) - Put a blank line after #define in sch_dualpi2.c (Stephen Hemminger <stephen(a)networkplumber.org>) - Fix line length warning. v3 (19-Oct-2024) - Fix compilaiton error - Update Documentation/netlink/specs/tc.yaml (Jakub Kicinski <kuba(a)kernel.org>) v2 (18-Oct-2024) - Add Documentation/netlink/specs/tc.yaml (Jakub Kicinski <kuba(a)kernel.org>) - Use dualpi2 instead of skb prefix (Jamal Hadi Salim <jhs(a)mojatatu.com>) - Replace nla_parse_nested_deprecated with nla_parse_nested (Jamal Hadi Salim <jhs(a)mojatatu.com>) - Fix line length warning --- Chia-Yu Chang (5): sched: Struct definition and parsing of dualpi2 qdisc sched: Dump configuration and statistics of dualpi2 qdisc selftests/tc-testing: Fix warning and style check on tdc.sh selftests/tc-testing: Add selftests for qdisc DualPI2 Documentation: netlink: specs: tc: Add DualPI2 specification Koen De Schepper (1): sched: Add enqueue/dequeue of dualpi2 qdisc Documentation/netlink/specs/tc.yaml | 151 ++- include/net/dropreason-core.h | 6 + include/uapi/linux/pkt_sched.h | 68 + net/sched/Kconfig | 12 + net/sched/Makefile | 1 + net/sched/sch_dualpi2.c | 1174 +++++++++++++++++ tools/testing/selftests/tc-testing/config | 1 + .../tc-testing/tc-tests/qdiscs/dualpi2.json | 254 ++++ tools/testing/selftests/tc-testing/tdc.sh | 6 +- 9 files changed, 1668 insertions(+), 5 deletions(-) create mode 100644 net/sched/sch_dualpi2.c create mode 100644 tools/testing/selftests/tc-testing/tc-tests/qdiscs/dualpi2.json -- 2.34.1

5 months

2
7
0 0

[PATCH 0/2] Fix undetected overflow when allocating IOVA

by Jason Gunthorpe

Syzkaller found this, the ALIGN() call can overflow and corrupt the allocation process. Fix the bug and add some test coverage. Signed-off-by: Jason Gunthorpe <jgg(a)nvidia.com> Jason Gunthorpe (2): iommufd: Prevent ALIGN() overflow iommufd/selftest: Test reserved regions near ULONG_MAX drivers/iommu/iommufd/io_pagetable.c | 41 +++++++++++++++---------- tools/testing/selftests/iommu/iommufd.c | 18 +++++++++++ 2 files changed, 43 insertions(+), 16 deletions(-) base-commit: 601b1d0d9395c711383452bd0d47037afbbb4bcf -- 2.43.0

5 months

4
13
0 0

[PATCH v2] selftests/damon: introduce _common.sh to host shared function

by Enze Li

The current test scripts contain duplicated root permission checks in multiple locations. This patch consolidates these checks into _common.sh to eliminate code redundancy. Signed-off-by: Enze Li <lienze(a)kylinos.cn> --- tools/testing/selftests/damon/_common.sh | 11 +++++++++++ tools/testing/selftests/damon/lru_sort.sh | 8 +++----- tools/testing/selftests/damon/reclaim.sh | 8 +++----- tools/testing/selftests/damon/sysfs.sh | 11 ++--------- .../damon/sysfs_update_removed_scheme_dir.sh | 8 +++----- 5 files changed, 22 insertions(+), 24 deletions(-) create mode 100644 tools/testing/selftests/damon/_common.sh diff --git a/tools/testing/selftests/damon/_common.sh b/tools/testing/selftests/damon/_common.sh new file mode 100644 index 000000000000..0279698f733e --- /dev/null +++ b/tools/testing/selftests/damon/_common.sh @@ -0,0 +1,11 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +check_dependencies() +{ + if [ $EUID -ne 0 ] + then + echo "Run as root" + exit $ksft_skip + fi +} diff --git a/tools/testing/selftests/damon/lru_sort.sh b/tools/testing/selftests/damon/lru_sort.sh index 61b80197c896..1e4849db78a9 100755 --- a/tools/testing/selftests/damon/lru_sort.sh +++ b/tools/testing/selftests/damon/lru_sort.sh @@ -1,14 +1,12 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 +source _common.sh + # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 -if [ $EUID -ne 0 ] -then - echo "Run as root" - exit $ksft_skip -fi +check_dependencies damon_lru_sort_enabled="/sys/module/damon_lru_sort/parameters/enabled" if [ ! -f "$damon_lru_sort_enabled" ] diff --git a/tools/testing/selftests/damon/reclaim.sh b/tools/testing/selftests/damon/reclaim.sh index 78dbc2334cbe..e56ceb035129 100755 --- a/tools/testing/selftests/damon/reclaim.sh +++ b/tools/testing/selftests/damon/reclaim.sh @@ -1,14 +1,12 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 +source _common.sh + # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 -if [ $EUID -ne 0 ] -then - echo "Run as root" - exit $ksft_skip -fi +check_dependencies damon_reclaim_enabled="/sys/module/damon_reclaim/parameters/enabled" if [ ! -f "$damon_reclaim_enabled" ] diff --git a/tools/testing/selftests/damon/sysfs.sh b/tools/testing/selftests/damon/sysfs.sh index e9a976d296e2..83e3b7f63d81 100755 --- a/tools/testing/selftests/damon/sysfs.sh +++ b/tools/testing/selftests/damon/sysfs.sh @@ -1,6 +1,8 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 +source _common.sh + # Kselftest frmework requirement - SKIP code is 4. ksft_skip=4 @@ -364,14 +366,5 @@ test_damon_sysfs() test_kdamonds "$damon_sysfs/kdamonds" } -check_dependencies() -{ - if [ $EUID -ne 0 ] - then - echo "Run as root" - exit $ksft_skip - fi -} - check_dependencies test_damon_sysfs "/sys/kernel/mm/damon/admin" diff --git a/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh b/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh index ade35576e748..35fc32beeaf7 100755 --- a/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh +++ b/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh @@ -1,14 +1,12 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 +source _common.sh + # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 -if [ $EUID -ne 0 ] -then - echo "Run as root" - exit $ksft_skip -fi +check_dependencies damon_sysfs="/sys/kernel/mm/damon/admin" if [ ! -d "$damon_sysfs" ] base-commit: e2291551827fe5d2d3758c435c191d32b6d1350e -- 2.43.0

5 months

2
1
0 0

[PATCH] selftests/damon: introduce _common.sh to host shared function

by Enze Li

The current test scripts contain duplicated root permission checks in multiple locations. This patch consolidates these checks into _common.sh to eliminate code redundancy. Signed-off-by: Enze Li <lienze(a)kylinos.cn> --- tools/testing/selftests/damon/_common.sh | 14 ++++++++++++++ tools/testing/selftests/damon/lru_sort.sh | 9 ++------- tools/testing/selftests/damon/reclaim.sh | 9 ++------- tools/testing/selftests/damon/sysfs.sh | 12 +----------- .../damon/sysfs_update_removed_scheme_dir.sh | 9 ++------- 5 files changed, 21 insertions(+), 32 deletions(-) create mode 100644 tools/testing/selftests/damon/_common.sh diff --git a/tools/testing/selftests/damon/_common.sh b/tools/testing/selftests/damon/_common.sh new file mode 100644 index 000000000000..3920b619c30f --- /dev/null +++ b/tools/testing/selftests/damon/_common.sh @@ -0,0 +1,14 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +# Kselftest frmework requirement - SKIP code is 4. +ksft_skip=4 + +check_dependencies() +{ + if [ $EUID -ne 0 ] + then + echo "Run as root" + exit $ksft_skip + fi +} diff --git a/tools/testing/selftests/damon/lru_sort.sh b/tools/testing/selftests/damon/lru_sort.sh index 61b80197c896..0d128d809fd3 100755 --- a/tools/testing/selftests/damon/lru_sort.sh +++ b/tools/testing/selftests/damon/lru_sort.sh @@ -1,14 +1,9 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 -# Kselftest framework requirement - SKIP code is 4. -ksft_skip=4 +source _common.sh -if [ $EUID -ne 0 ] -then - echo "Run as root" - exit $ksft_skip -fi +check_dependencies damon_lru_sort_enabled="/sys/module/damon_lru_sort/parameters/enabled" if [ ! -f "$damon_lru_sort_enabled" ] diff --git a/tools/testing/selftests/damon/reclaim.sh b/tools/testing/selftests/damon/reclaim.sh index 78dbc2334cbe..41e450a696ae 100755 --- a/tools/testing/selftests/damon/reclaim.sh +++ b/tools/testing/selftests/damon/reclaim.sh @@ -1,14 +1,9 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 -# Kselftest framework requirement - SKIP code is 4. -ksft_skip=4 +source _common.sh -if [ $EUID -ne 0 ] -then - echo "Run as root" - exit $ksft_skip -fi +check_dependencies damon_reclaim_enabled="/sys/module/damon_reclaim/parameters/enabled" if [ ! -f "$damon_reclaim_enabled" ] diff --git a/tools/testing/selftests/damon/sysfs.sh b/tools/testing/selftests/damon/sysfs.sh index e9a976d296e2..0326b9ad55ca 100755 --- a/tools/testing/selftests/damon/sysfs.sh +++ b/tools/testing/selftests/damon/sysfs.sh @@ -1,8 +1,7 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 -# Kselftest frmework requirement - SKIP code is 4. -ksft_skip=4 +source _common.sh ensure_write_succ() { @@ -364,14 +363,5 @@ test_damon_sysfs() test_kdamonds "$damon_sysfs/kdamonds" } -check_dependencies() -{ - if [ $EUID -ne 0 ] - then - echo "Run as root" - exit $ksft_skip - fi -} - check_dependencies test_damon_sysfs "/sys/kernel/mm/damon/admin" diff --git a/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh b/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh index ade35576e748..730165bd7f03 100755 --- a/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh +++ b/tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh @@ -1,14 +1,9 @@ #!/bin/bash # SPDX-License-Identifier: GPL-2.0 -# Kselftest framework requirement - SKIP code is 4. -ksft_skip=4 +source _common.sh -if [ $EUID -ne 0 ] -then - echo "Run as root" - exit $ksft_skip -fi +check_dependencies damon_sysfs="/sys/kernel/mm/damon/admin" if [ ! -d "$damon_sysfs" ] base-commit: e2291551827fe5d2d3758c435c191d32b6d1350e -- 2.43.0

5 months

3
4
0 0

[PATCH 0/2] selftests/cgroup: better bound for cpu.max tests

by Shashank Balaji

cpu.max selftests (both the normal one and the nested one) test the working of throttling by setting up cpu.max, running a cpu hog process for a specified duration, and comparing usage_usec as reported by cpu.stat with the duration of the cpu hog: they should be far enough. Currently, this is done by using values_close, which has two problems: 1. Semantic: values_close is used with an error percentage of 95%, which one will not expect on seeing "values close". The intent it's actually going for is "values far". 2. Accuracy: the tests can pass even if usage_usec is upto around double the expected amount. That's too high of a margin for usage_usec. Overall, this patchset improves the readability and accuracy of the cpu.max tests. Signed-off-by: Shashank Balaji <shashank.mahadasyam(a)sony.com> --- Shashank Balaji (2): selftests/cgroup: rename `expected` to `duration` in cpu.max tests selftests/cgroup: better bound in cpu.max tests tools/testing/selftests/cgroup/test_cpu.c | 42 ++++++++++++++++++------------- 1 file changed, 24 insertions(+), 18 deletions(-) --- base-commit: 66701750d5565c574af42bef0b789ce0203e3071 change-id: 20250227-kselftest-cgroup-fix-cpu-max-56619928e99b Best regards, -- Shashank Balaji <shashank.mahadasyam(a)sony.com>

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