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mm/damon/core: use kvmalloc for target regions array

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Patch series "mm/damon: five misc fixups"

Five patches for miscellaneous DAMON fixups.  Use better fit kernel
functions, cleanup/fixup documents, and add unit tests.

The five patches were initially sent and revisioned by different
individuals.  Each patch contains changelog on their commentary area.  The
patches are curated into this series by SJ, for the convenience in
reposting.


This patch (of 5):

damon_commit_target_regions() temporarily allocates a single contiguous
memory region using kmalloc to store copies of all damon_regions of the
damon_target.  However, if the damon_target has a large number of
damon_regions, the total size may exceed KMALLOC_MAX_SIZE.

This problem can be avoided by using kvmalloc instead of kmalloc.

Link: https://lore.kernel.org/20260629145538.134832-1-sj@kernel.org
Link: https://lore.kernel.org/20260629145538.134832-2-sj@kernel.org
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: SJ Park <sj@kernel.org>
Reviewed-by: SJ Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Cc: Doehyun Baek <doehyunbaek@gmail.com>
Cc: Philippe Laferriere <plafer@proton.me>
Cc: Sailesh Nandanavanam <saileshnandanavanam@gmail.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Akinobu Mita
2026-06-29 07:55:32 -07:00
committed by Andrew Morton
parent 99cea7eb52
commit 2817eaec9c
1 changed files with 2 additions and 2 deletions
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4
mm/damon/core.c
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@@ -1369,14 +1369,14 @@ static int damon_commit_target_regions(struct damon_target *dst,
if (!i)
return 0;
ranges = kmalloc_objs(*ranges, i, GFP_KERNEL | __GFP_NOWARN);
ranges = kvmalloc_objs(*ranges, i, GFP_KERNEL | __GFP_NOWARN);
if (!ranges)
return -ENOMEM;
i = 0;
damon_for_each_region(src_region, src)
ranges[i++] = src_region->ar;
err = damon_set_regions(dst, ranges, i, src_min_region_sz);
kfree(ranges);
kvfree(ranges);
return err;
}