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USDT BTC & ETH LOST TO SCAMMER ONLINE VISIT AUTOTECH RECOVERY COMPANY FOR HELP

by josiahdavidson1122＠gmail.com

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4 days, 9 hours

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by Eddie Jolley

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4 days, 9 hours

Re: [PATCH v2 0/3] dma-buf: heaps: cma: enable dmem cgroup accounting

by T.J. Mercier

On Wed, Feb 18, 2026 at 9:15 AM Eric Chanudet <echanude(a)redhat.com> wrote: Hi Eric, > An earlier series[1] from Maxime introduced dmem to the cma allocator in > an attempt to use it generally for dma-buf. Restart from there and apply > the charge in the narrower context of the CMA dma-buf heap instead. > > In line with introducing cgroup to the system heap[2], this behavior is > enabled based on dma_heap.mem_accounting, disabled by default. > > dmem is chosen for CMA heaps as it allows limits to be set for each > region backing each heap. The charge is only put in the dma-buf heap for > now as it guaranties it can be accounted against a userspace process > that requested the allocation. But CMA memory is system memory, and regular (non-CMA) movable allocations can occur out of these CMA areas. So this splits system memory accounting between memcg (from [2]) and dmem. If I want to put a limit on system memory use I have to adjust multiple limits (memcg + dmems) and know how to divide the total between them all. How do you envision using this combination of different controllers? Thanks, T.J. > [1] https://lore.kernel.org/all/20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.… > [2] https://lore.kernel.org/all/20260116-dmabuf-heap-system-memcg-v3-0-ecc6b62c… > > Signed-off-by: Eric Chanudet <echanude(a)redhat.com> > --- > Changes in v2: > - Rebase on Maxime's introduction of dmem to the cma allocator: > https://lore.kernel.org/all/20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.… > - Remove the dmem region registration from the cma dma-buf heap > - Remove the misplaced logic for the default region. > - Link to v1: https://lore.kernel.org/r/20260130-dmabuf-heap-cma-dmem-v1-1-3647ea993e99@r… > > --- > Eric Chanudet (1): > dma-buf: heaps: cma: charge each cma heap's dmem > > Maxime Ripard (2): > cma: Register dmem region for each cma region > cma: Provide accessor to cma dmem region > > drivers/dma-buf/heaps/cma_heap.c | 15 ++++++++++++++- > include/linux/cma.h | 9 +++++++++ > mm/cma.c | 20 +++++++++++++++++++- > mm/cma.h | 3 +++ > 4 files changed, 45 insertions(+), 2 deletions(-) > --- > base-commit: 948e195dfaa56e48eabda591f97630502ff7e27e > change-id: 20260128-dmabuf-heap-cma-dmem-f4120a2df4a8 > > Best regards, > -- > Eric Chanudet <echanude(a)redhat.com> >

4 days, 9 hours

Re: [PATCH v2 3/3] dma-buf: heaps: cma: charge each cma heap's dmem

by Christian König

On 2/19/26 18:10, Eric Chanudet wrote: > On Thu, Feb 19, 2026 at 08:17:28AM +0100, Christian König wrote: >> >> >> On 2/18/26 18:14, Eric Chanudet wrote: >>> The cma dma-buf heaps let userspace allocate buffers in CMA regions >>> without enforcing limits. Since each cma region registers in dmem, >>> charge against it when allocating a buffer in a cma heap. >>> >>> Signed-off-by: Eric Chanudet <echanude(a)redhat.com> >>> --- >>> drivers/dma-buf/heaps/cma_heap.c | 15 ++++++++++++++- >>> 1 file changed, 14 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c >>> index 49cc45fb42dd7200c3c14384bcfdbe85323454b1..bbd4f9495808da19256d97bd6a4dca3e1b0a30a0 100644 >>> --- a/drivers/dma-buf/heaps/cma_heap.c >>> +++ b/drivers/dma-buf/heaps/cma_heap.c >>> @@ -27,6 +27,7 @@ >>> #include <linux/scatterlist.h> >>> #include <linux/slab.h> >>> #include <linux/vmalloc.h> >>> +#include <linux/cgroup_dmem.h> >>> >>> #define DEFAULT_CMA_NAME "default_cma_region" >>> >>> @@ -58,6 +59,7 @@ struct cma_heap_buffer { >>> pgoff_t pagecount; >>> int vmap_cnt; >>> void *vaddr; >>> + struct dmem_cgroup_pool_state *pool; >>> }; >>> >>> struct dma_heap_attachment { >>> @@ -276,6 +278,7 @@ static void cma_heap_dma_buf_release(struct dma_buf *dmabuf) >>> kfree(buffer->pages); >>> /* release memory */ >>> cma_release(cma_heap->cma, buffer->cma_pages, buffer->pagecount); >>> + dmem_cgroup_uncharge(buffer->pool, buffer->len); >>> kfree(buffer); >>> } >>> >>> @@ -319,9 +322,17 @@ static struct dma_buf *cma_heap_allocate(struct dma_heap *heap, >>> if (align > CONFIG_CMA_ALIGNMENT) >>> align = CONFIG_CMA_ALIGNMENT; >>> >>> + if (mem_accounting) { >> >> Since mem_accounting is a module parameter it is possible to make it changeable during runtime. >> >> IIRC it currently is read only, but maybe add a one line comment that the cma heap now depends on that. >> > > Agreed, while read-only it is easily missed without at least a comment. > Alternatively, should that value be captured in the init callback to > guaranty it is set once and make this requirement clearer? It probably makes more sense to make nails with heads and make it runtime configurable. I'm not sure how exactly dmem_cgroup_try_charge()/dmem_cgroup_uncharge() works, could be that it works correctly out of the box and you just need to initialize buffer->pool to NULL when mem_accounting is not enabled. Regards, Christian. > > Thanks, > >> Apart from that the series looks totally sane to me. >> >> Regards, >> Christian. >> >>> + ret = dmem_cgroup_try_charge( >>> + cma_get_dmem_cgroup_region(cma_heap->cma), size, >>> + &buffer->pool, NULL); >>> + if (ret) >>> + goto free_buffer; >>> + } >>> + >>> cma_pages = cma_alloc(cma_heap->cma, pagecount, align, false); >>> if (!cma_pages) >>> - goto free_buffer; >>> + goto uncharge_cgroup; >>> >>> /* Clear the cma pages */ >>> if (PageHighMem(cma_pages)) { >>> @@ -376,6 +387,8 @@ static struct dma_buf *cma_heap_allocate(struct dma_heap *heap, >>> kfree(buffer->pages); >>> free_cma: >>> cma_release(cma_heap->cma, cma_pages, pagecount); >>> +uncharge_cgroup: >>> + dmem_cgroup_uncharge(buffer->pool, size); >>> free_buffer: >>> kfree(buffer); >>> >>> >> >

4 days, 10 hours

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by Jane Pamela

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4 days, 21 hours