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[RFC PATCH 0/2] Implement get_user_pages_fast for ARM

by Steve Capper

This patch series implements get_user_pages_fast on ARM. Unlike other architectures, we do not use IPIs/disabled IRQs as a blocking mechanism to protect the page table walker. Instead an atomic counter is used to indicate how many fast gup walkers are active on an address space, and any code that would cause them problems (THP splitting or code that could free a page table page) spins on positive values of this counter. This series also addresses an assumption made in kernel/futex.c that THP page splitting can be blocked by disabling the IRQs on a processor by introducing arch_block_thp_split and arch_unblock_thp_split. As well as fixing a problem where futexes on THP tails cause hangs on ARM, I expect this series to also be beneficial for direct-IO, and for KVM (the hva_to_pfn fast path uses __get_user_pages_fast). Any comments would be greatly appreciated. Steve Capper (2): thp: Introduce arch_(un)block_thp_split arm: mm: implement get_user_pages_fast arch/arm/include/asm/mmu.h | 1 + arch/arm/include/asm/pgalloc.h | 9 ++ arch/arm/include/asm/pgtable-2level.h | 1 + arch/arm/include/asm/pgtable-3level.h | 21 +++ arch/arm/include/asm/pgtable.h | 18 +++ arch/arm/include/asm/tlb.h | 8 ++ arch/arm/mm/Makefile | 2 +- arch/arm/mm/gup.c | 234 ++++++++++++++++++++++++++++++++++ include/linux/huge_mm.h | 16 +++ kernel/futex.c | 6 +- 10 files changed, 312 insertions(+), 4 deletions(-) create mode 100644 arch/arm/mm/gup.c -- 1.8.1.4

11 years, 8 months

mainline boot: 31 pass, 0 fail (v3.12-rc7-20-g7314e61)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: mainline Git describe: v3.12-rc7-20-g7314e61 Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 30.1 sec omap3-beagle-xm PASS: 0 min 53.3 sec am335x-bone PASS: 0 min 26.1 sec omap4-panda PASS: 1 min 9.0 sec omap4-panda-es PASS: 1 min 4.6 sec omap3-tobi,3730storm PASS: 0 min 20.6 sec omap3-tobi,3530overo PASS: 0 min 21.5 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 16.9 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 16.1 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.2 sec imx6q-wandboard PASS: 0 min 14.8 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 22.0 sec armada-370-mirabox PASS: 0 min 19.9 sec exynos_defconfig ---------------- exynos5250-arndale PASS: 0 min 28.9 sec multi_v7_defconfig ------------------ ste-snowball PASS: 0 min 25.1 sec tegra30-beaver PASS: 0 min 20.9 sec am335x-boneblack PASS: 0 min 34.5 sec omap3-beagle-xm PASS: 0 min 51.7 sec armada-370-mirabox PASS: 0 min 20.5 sec omap4-panda PASS: 1 min 17.2 sec omap4-panda-es PASS: 1 min 6.3 sec armada-xp-openblocks-ax3-4 PASS: 0 min 22.8 sec sun4i-a10-cubieboard PASS: 0 min 13.8 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.3 sec am335x-bone PASS: 0 min 33.2 sec imx6q-wandboard PASS: 0 min 15.7 sec omap3-tobi,3730storm PASS: 0 min 19.5 sec imx6dl-wandboard,wand-dual PASS: 0 min 16.6 sec omap3-tobi,3530overo PASS: 0 min 19.9 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 33.8 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.3 sec

11 years, 8 months

mainline boot: 30 pass, 0 fail (v3.12-rc6-303-g20582e3)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: mainline Git describe: v3.12-rc6-303-g20582e3 Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 29.6 sec omap3-beagle-xm PASS: 0 min 51.2 sec am335x-bone PASS: 0 min 26.1 sec omap4-panda PASS: 1 min 5.6 sec omap4-panda-es PASS: 1 min 5.4 sec omap3-tobi,3730storm PASS: 0 min 23.3 sec omap3-tobi,3530overo PASS: 0 min 21.3 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 16.9 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 16.1 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.0 sec imx6q-wandboard PASS: 0 min 14.7 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 22.0 sec armada-370-mirabox PASS: 0 min 19.9 sec exynos_defconfig ---------------- exynos5250-arndale PASS: 0 min 28.9 sec multi_v7_defconfig ------------------ ste-snowball PASS: 0 min 25.4 sec tegra30-beaver PASS: 0 min 17.1 sec am335x-boneblack PASS: 0 min 34.5 sec omap3-beagle-xm PASS: 0 min 50.3 sec armada-370-mirabox PASS: 0 min 20.5 sec omap4-panda PASS: 1 min 9.2 sec omap4-panda-es PASS: 1 min 3.6 sec armada-xp-openblocks-ax3-4 PASS: 0 min 22.7 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.3 sec am335x-bone PASS: 0 min 33.2 sec imx6q-wandboard PASS: 0 min 15.7 sec omap3-tobi,3730storm PASS: 0 min 22.6 sec imx6dl-wandboard,wand-dual PASS: 0 min 16.6 sec omap3-tobi,3530overo PASS: 0 min 19.6 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 36.4 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.2 sec

11 years, 8 months

[GIT PULL]: CPUFreq: ARM Updates for 3.13

by Viresh Kumar

Hi Rafael, I have pushed ARM cpufreq patches for v3.13, you can pull them from my repo. Sorry if I am late... The following changes since commit 959f58544b7f20c92d5eb43d1232c96c15c01bfb: Linux 3.12-rc7 (2013-10-27 16:12:03 -0700) are available in the git repository at: git://git.linaro.org/people/vireshk/linux.git cpufreq-next-for-3.13 for you to fetch changes up to 2332c7a7a8c1979de68429dcdcb125037ef35f4b: cpufreq: arm_big_little: reconfigure switcher behavior at run time (2013-10-29 03:18:41 +0530) ---------------------------------------------------------------- Nicolas Pitre (1): cpufreq: arm_big_little: reconfigure switcher behavior at run time Sudeep KarkadaNagesha (5): cpufreq: arm-big-little: use clk_get instead of clk_get_sys ARM: vexpress/TC2: add support for CPU DVFS ARM: vexpress/TC2: add cpu clock support cpufreq: arm_big_little: add vexpress SPC interface driver ARM: vexpress/TC2: register vexpress-spc cpufreq device Viresh Kumar (1): cpufreq: arm_big_little: add in-kernel switching (IKS) support arch/arm/mach-vexpress/Kconfig | 12 + arch/arm/mach-vexpress/Makefile | 3 +- arch/arm/mach-vexpress/spc.c | 366 +++++++++++++++++++++++++++- arch/arm/mach-vexpress/spc.h | 2 +- arch/arm/mach-vexpress/tc2_pm.c | 7 +- drivers/cpufreq/Kconfig.arm | 8 + drivers/cpufreq/Makefile | 1 + drivers/cpufreq/arm_big_little.c | 420 ++++++++++++++++++++++++++++++--- drivers/cpufreq/arm_big_little.h | 5 - drivers/cpufreq/vexpress-spc-cpufreq.c | 69 ++++++ 10 files changed, 853 insertions(+), 40 deletions(-) create mode 100644 drivers/cpufreq/vexpress-spc-cpufreq.c

11 years, 8 months

next boot: 29 pass, 2 fail (next-20131029)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: next Git describe: next-20131029 Failed boot tests (console logs at the end) =========================================== exynos5250-arndale: FAIL: exynos_defconfig sun4i-a10-cubieboard: FAIL: multi_v7_defconfig Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 28.1 sec omap3-beagle-xm PASS: 0 min 53.1 sec am335x-bone PASS: 0 min 26.8 sec omap4-panda PASS: 1 min 5.4 sec omap4-panda-es PASS: 1 min 4.0 sec omap3-tobi,3730storm PASS: 0 min 23.5 sec omap3-tobi,3530overo PASS: 0 min 21.5 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 17.0 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 16.9 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.9 sec imx6q-wandboard PASS: 0 min 15.2 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 21.8 sec armada-370-mirabox PASS: 0 min 19.8 sec exynos_defconfig ---------------- exynos5250-arndale FAIL: 0 min 33.5 sec multi_v7_defconfig ------------------ ste-snowball PASS: 0 min 25.4 sec tegra30-beaver PASS: 0 min 17.1 sec am335x-boneblack PASS: 0 min 34.9 sec omap3-beagle-xm PASS: 0 min 50.3 sec armada-370-mirabox PASS: 0 min 20.6 sec omap4-panda PASS: 1 min 2.7 sec omap4-panda-es PASS: 1 min 2.6 sec armada-xp-openblocks-ax3-4 PASS: 0 min 22.7 sec sun4i-a10-cubieboard FAIL: 0 min 6.9 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.6 sec am335x-bone PASS: 0 min 33.6 sec imx6q-wandboard PASS: 0 min 16.9 sec omap3-tobi,3730storm PASS: 0 min 19.4 sec imx6dl-wandboard,wand-dual PASS: 0 min 16.7 sec omap3-tobi,3530overo PASS: 0 min 20.0 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 28.8 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.3 sec Console logs for failures ========================= exynos_defconfig ---------------- exynos5250-arndale: FAIL: last 24 lines of boot log: ---------------------------------------------------- tftp 0x407c0000 tmp/arndale-nlSgUm/exynos5250-arndale.dtb Waiting for Ethernet connection... done. Using asx0 device TFTP from server 192.168.1.2; our IP address is 192.168.1.171 Filename 'tmp/arndale-nlSgUm/exynos5250-arndale.dtb'. Load address: 0x407c0000 Loading: *### done Bytes transferred = 33005 (80ed hex) ARNDALE5250 # printenv bootargs printenv bootargs bootargs=console=tty0 console=ttySAC2,115200n8 rw root=/dev/mmcblk1p3 rootwait rootfstype=ext4 ip=192.168.1.171:192.168.1.2:192.168.1.254:255.255.255.0::::192.168.1.254:none ARNDALE5250 # bootz 0x40800000 - 0x407c0000 bootz 0x40800000 - 0x407c0000 ## Flattened Device Tree blob at 407c0000 Booting using the fdt blob at 0x407c0000 Using Device Tree in place at 407c0000, end 407cb0ec Starting kernel ... ~$off # PYBOOT: Exception: kernel: ERROR: did not start booting. # PYBOOT: Time: 33.50 seconds. # PYBOOT: Result: FAIL multi_v7_defconfig ------------------ sun4i-a10-cubieboard: FAIL: last 24 lines of boot log: ------------------------------------------------------ U-Boot 2011.09-rc1 (Nov 26 2012 - 14:01:52) Allwinner Technology arm-none-linux-gnueabi-gcc (Sourcery G++ Lite 2010.09-50) 4.5.1 GNU ld (Sourcery G++ Lite 2010.09-50) 2.20.51.20100809 sunxi#setenv ethaddr 2e:40:70:f0:12:08 setenv ethaddr 2e:40:70:f0:12:08 sunxi#setenv bootargs console=ttyS0,115200 earlyprintk rw root=/dev/mmcblk0p2 rootwait rootfstype=ext4 setenv bootargs console=ttyS0,115200 earlyprintk rw root=/dev/mmcblk0p2 rootwait rootfstype=ext4 sunxi#setenv netargs 'setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}::::192.168.1.254:none' setenv netargs 'setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}::::192.168.1.254:none' sunxi#setenv initrd_high 0xffffffff setenv initrd_high 0xffffffff sunxi#if test -n ${initenv}; then run initenv; fi if test -n ${initenv}; then run initenv; fi sunxi#if test -n ${preboot}; then run preboot; fi if test -n ${preboot}; then run preboot; fi sunxi#setenv autoload no; setenv autoboot no setenv autoload no; setenv autoboot no sunxi#dhcp dhcp Unknown command 'dhcp' - try 'help' sunxi#~$off # PYBOOT: Exception: u-boot: does not support DHCP. Giving up. # PYBOOT: Time: 6.90 seconds. # PYBOOT: Result: FAIL

11 years, 8 months

mainline boot: 31 pass, 0 fail (v3.12-rc7-9-gc9ca72f)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: mainline Git describe: v3.12-rc7-9-gc9ca72f Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 29.8 sec omap3-beagle-xm PASS: 0 min 52.7 sec am335x-bone PASS: 0 min 26.1 sec omap4-panda PASS: 1 min 6.0 sec omap4-panda-es PASS: 1 min 7.8 sec omap3-tobi,3730storm PASS: 0 min 20.2 sec omap3-tobi,3530overo PASS: 0 min 21.1 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 16.8 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 16.2 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.0 sec imx6q-wandboard PASS: 0 min 14.8 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 21.9 sec armada-370-mirabox PASS: 0 min 19.9 sec exynos_defconfig ---------------- exynos5250-arndale PASS: 0 min 29.8 sec multi_v7_defconfig ------------------ ste-snowball PASS: 0 min 25.2 sec tegra30-beaver PASS: 0 min 17.3 sec am335x-boneblack PASS: 0 min 34.4 sec omap3-beagle-xm PASS: 0 min 50.6 sec armada-370-mirabox PASS: 0 min 20.6 sec omap4-panda PASS: 1 min 10.1 sec omap4-panda-es PASS: 1 min 1.7 sec armada-xp-openblocks-ax3-4 PASS: 0 min 22.7 sec sun4i-a10-cubieboard PASS: 0 min 13.7 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.4 sec am335x-bone PASS: 0 min 33.3 sec imx6q-wandboard PASS: 0 min 15.7 sec omap3-tobi,3730storm PASS: 0 min 22.4 sec imx6dl-wandboard,wand-dual PASS: 0 min 16.6 sec omap3-tobi,3530overo PASS: 0 min 20.1 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 33.6 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.3 sec

11 years, 8 months

arm-soc boot: 30 pass, 1 fail (v3.12-rc5-858-g751ad9e)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: arm-soc Git describe: v3.12-rc5-858-g751ad9e Failed boot tests (console logs at the end) =========================================== sun4i-a10-cubieboard: FAIL: multi_v7_defconfig Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 28.0 sec omap3-beagle-xm PASS: 0 min 53.4 sec am335x-bone PASS: 0 min 26.7 sec omap4-panda PASS: 1 min 2.5 sec omap4-panda-es PASS: 1 min 4.1 sec omap3-tobi,3730storm PASS: 0 min 23.4 sec omap3-tobi,3530overo PASS: 0 min 21.5 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 16.9 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 18.0 sec imx6dl-wandboard,wand-solo PASS: 0 min 18.2 sec imx6q-wandboard PASS: 0 min 16.5 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 21.9 sec armada-370-mirabox PASS: 0 min 19.9 sec exynos_defconfig ---------------- exynos5250-arndale PASS: 0 min 28.9 sec multi_v7_defconfig ------------------ ste-snowball PASS: 0 min 28.4 sec tegra30-beaver PASS: 0 min 14.3 sec am335x-boneblack PASS: 0 min 34.8 sec omap3-beagle-xm PASS: 0 min 51.4 sec armada-370-mirabox PASS: 0 min 20.6 sec omap4-panda PASS: 1 min 4.2 sec omap4-panda-es PASS: 1 min 5.0 sec armada-xp-openblocks-ax3-4 PASS: 0 min 22.6 sec sun4i-a10-cubieboard FAIL: 0 min 7.0 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.4 sec am335x-bone PASS: 0 min 33.6 sec imx6q-wandboard PASS: 0 min 15.7 sec omap3-tobi,3730storm PASS: 0 min 24.1 sec imx6dl-wandboard,wand-dual PASS: 0 min 16.6 sec omap3-tobi,3530overo PASS: 0 min 19.8 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 31.9 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.4 sec Console logs for failures ========================= multi_v7_defconfig ------------------ sun4i-a10-cubieboard: FAIL: last 24 lines of boot log: ------------------------------------------------------ U-Boot 2011.09-rc1 (Nov 26 2012 - 14:01:52) Allwinner Technology arm-none-linux-gnueabi-gcc (Sourcery G++ Lite 2010.09-50) 4.5.1 GNU ld (Sourcery G++ Lite 2010.09-50) 2.20.51.20100809 sunxi#setenv ethaddr 2e:40:70:f0:12:08 setenv ethaddr 2e:40:70:f0:12:08 sunxi#setenv bootargs console=ttyS0,115200 earlyprintk rw root=/dev/mmcblk0p2 rootwait rootfstype=ext4 setenv bootargs console=ttyS0,115200 earlyprintk rw root=/dev/mmcblk0p2 rootwait rootfstype=ext4 sunxi#setenv netargs 'setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}::::192.168.1.254:none' setenv netargs 'setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}::::192.168.1.254:none' sunxi#setenv initrd_high 0xffffffff setenv initrd_high 0xffffffff sunxi#if test -n ${initenv}; then run initenv; fi if test -n ${initenv}; then run initenv; fi sunxi#if test -n ${preboot}; then run preboot; fi if test -n ${preboot}; then run preboot; fi sunxi#setenv autoload no; setenv autoboot no setenv autoload no; setenv autoboot no sunxi#dhcp dhcp Unknown command 'dhcp' - try 'help' sunxi#~$off # PYBOOT: Exception: u-boot: does not support DHCP. Giving up. # PYBOOT: Time: 6.96 seconds. # PYBOOT: Result: FAIL

11 years, 8 months

arm-soc boot: 31 pass, 0 fail (v3.12-rc5-856-g4f0b2da)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: arm-soc Git describe: v3.12-rc5-856-g4f0b2da Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 28.0 sec omap3-beagle-xm PASS: 0 min 56.4 sec am335x-bone PASS: 0 min 26.7 sec omap4-panda PASS: 1 min 1.8 sec omap4-panda-es PASS: 1 min 6.9 sec omap3-tobi,3730storm PASS: 0 min 23.4 sec omap3-tobi,3530overo PASS: 0 min 21.6 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 16.9 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 18.1 sec imx6dl-wandboard,wand-solo PASS: 0 min 18.2 sec imx6q-wandboard PASS: 0 min 16.4 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 22.1 sec armada-370-mirabox PASS: 0 min 19.9 sec exynos_defconfig ---------------- exynos5250-arndale PASS: 0 min 29.0 sec multi_v7_defconfig ------------------ ste-snowball PASS: 0 min 28.1 sec tegra30-beaver PASS: 0 min 17.3 sec am335x-boneblack PASS: 0 min 34.9 sec omap3-beagle-xm PASS: 0 min 47.8 sec armada-370-mirabox PASS: 0 min 20.6 sec omap4-panda PASS: 1 min 10.8 sec omap4-panda-es PASS: 1 min 10.3 sec armada-xp-openblocks-ax3-4 PASS: 0 min 22.9 sec sun4i-a10-cubieboard PASS: 0 min 13.8 sec imx6dl-wandboard,wand-solo PASS: 0 min 16.4 sec am335x-bone PASS: 0 min 33.7 sec imx6q-wandboard PASS: 0 min 16.8 sec omap3-tobi,3730storm PASS: 0 min 19.4 sec imx6dl-wandboard,wand-dual PASS: 0 min 16.6 sec omap3-tobi,3530overo PASS: 0 min 20.0 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 31.8 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.4 sec

11 years, 8 months

arm-soc boot: 16 pass, 0 fail (v3.12-rc5-703-g932c441)

by Kevin's boot bot

Automated DT boot report for various ARM defconfigs. Tree/Branch: arm-soc Git describe: v3.12-rc5-703-g932c441 Full Report =========== omap2plus_defconfig ------------------- am335x-boneblack PASS: 0 min 28.0 sec omap3-beagle-xm PASS: 0 min 52.8 sec am335x-bone PASS: 0 min 26.7 sec omap4-panda PASS: 1 min 4.4 sec omap4-panda-es PASS: 1 min 4.4 sec omap3-tobi,3730storm PASS: 0 min 23.9 sec omap3-tobi,3530overo PASS: 0 min 21.4 sec tegra_defconfig --------------- tegra30-beaver PASS: 0 min 19.6 sec imx_v6_v7_defconfig ------------------- imx6dl-wandboard,wand-dual PASS: 0 min 17.3 sec imx6dl-wandboard,wand-solo PASS: 0 min 17.2 sec imx6q-wandboard PASS: 0 min 15.8 sec mvebu_defconfig --------------- armada-xp-openblocks-ax3-4 PASS: 0 min 21.9 sec armada-370-mirabox PASS: 0 min 20.0 sec exynos_defconfig ---------------- exynos5250-arndale PASS: 0 min 33.7 sec u8500_defconfig --------------- ste-snowball PASS: 0 min 28.7 sec sama5_defconfig --------------- sama5d35ek PASS: 0 min 17.4 sec cat: v3.12-rc5-703-g932c441-boot-report.log: No such file or directory msmtp: no recipients found Traceback (most recent call last): File "/home/khilman/bin/boot-report.py", line 191, in <module> subprocess.check_output('cat %s | msmtp --read-envelope-from -t --' %maillog, shell=True) File "/usr/lib/python2.7/subprocess.py", line 544, in check_output raise CalledProcessError(retcode, cmd, output=output) subprocess.CalledProcessError: Command 'cat v3.12-rc5-703-g932c441-boot-report.log | msmtp --read-envelope-from -t --' returned non-zero exit status 64

11 years, 8 months

ARM GIC Virtualization question

by Mj Embd

Hi All, a) As per GIC-400 all Physical interrupts trap into hypervisor b) Hypervisor does ACK, programs Virtual GIC list registers (with PhysIRQ:VIRQ) and does a world switch. c) GIC CPU I/f interrupts Guest with the VIRQ d) Guest does a ACK and EOI to GIC cpu i/f e) Hypervisor gets a maintenance interrupt when Guest Does an EOI f) Hypervisor then clears the Physical Interrupt So for 1 interrupt there are so many context switches ? Is the sequence right. If I am missing anything please let me know .. Also, If a device is private to a guest, so many context switches would reduce the performance if the device interrupts a lot. My question is that a) Is the above flow correct ? b) Is this the only flow or there exists some optimisations Thanks and Regards

11 years, 8 months

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