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dma-buf: system_heap: account for system heap allocation in memcg 

The system dma-buf heap lets userspace allocate buffers from the page
allocator. However, these allocations are not accounted for in memcg,
allowing processes to escape limits that may be configured.

Pass __GFP_ACCOUNT for system heap allocations, based on the
dma_heap.mem_accounting parameter, to use memcg and account for them.

Signed-off-by: Eric Chanudet <echanude@redhat.com>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patch.msgid.link/20260116-dmabuf-heap-system-memcg-v3-2-ecc6b62cc446@redhat.com
This commit is contained in:
Eric Chanudet 2026-01-16 15:05:39 -05:00 committed by Sumit Semwal
parent bb33013bdd
commit 3c227be906
1 changed files with 5 additions and 2 deletions
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7
drivers/dma-buf/heaps/system_heap.c
View File

@ -320,14 +320,17 @@ static struct page *alloc_largest_available(unsigned long size,
{
struct page *page;
int i;
gfp_t flags;
for (i = 0; i < NUM_ORDERS; i++) {
if (size < (PAGE_SIZE << orders[i]))
continue;
if (max_order < orders[i])
continue;
page = alloc_pages(order_flags[i], orders[i]);
flags = order_flags[i];
if (mem_accounting)
flags |= __GFP_ACCOUNT;
page = alloc_pages(flags, orders[i]);
if (!page)
continue;
return page;