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b=f+GrKNZl7rNDdeHLjnA2IB+t3bNGbNvt5GRbLNylwd+JKc+cKoP7w8Fz4BYL4Rqqr gFT6c0KH0T1AalBrpEGas5knLBzNAM3qvYqjZgmVuUOlBw+q9989VvK6+yPzWb2UyW e0QOaZ+MVQJzwy1ggUIhkmRczkXuvnc7fh8IPD9if0B3NKooMt8jss/76jTUfviBmy /aoSOQH24JiPeacnNEtiIjHbY0GUe4qWT/w7Q318mehq/RvzxycjrT4l+0+hXqwr8i 6Z611YYQ+KzizEl3blr1WDy8CDzWgtqALDZj2RvKi44PiqoDTMlN4NBVQwzv99uzb2 pfz8FLfsvZcNg== From: SJ Park To: Andrew Morton Cc: Akinobu Mita , SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, SJ Park Subject: [PATCH 1/5] mm/damon/core: use kvmalloc for target regions array Date: Mon, 29 Jun 2026 07:55:32 -0700 Message-ID: <20260629145538.134832-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260629145538.134832-1-sj@kernel.org> References: <20260629145538.134832-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0DCFB140005 X-Rspam-User: X-Stat-Signature: 955tsb6ad1yhhwbhw81coz137nf36eon X-HE-Tag: 1782744944-455100 X-HE-Meta: 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 VTeWZrcd YHtSTpakVWrnXLMVEqshxa9YseOMKVTkco74axESHBYw2coJ4SIVbOzktQvuhJ/6fSi6FokH7MEUYJQv1C45lVkuBusgjW2VDfYZSOBoexF8aSDwC7pME616iZrFI9OyU8KLX1kiyXySmELG4aHiAsEIpppFU8bhN79Q5SXVO7hjQakYWr1Hy3kIf8rNGrCWDDsOHQFtj5ArB8yuVzuME53ThAUq0Ar70XtpKEpiwpMJz5tWv86/FZbRQw/uDLFRBHHde4Y4Ic3YxaRT2lxhMhgMeIckFnjGuCOl8RNjg7iA06K96ZKgygVPFfirdxfkHEAxhEkLEmv7A/+jOpyBuhDptdsT+OSPd9ALLwN5QLNZ8/bw+dVw9yux3OPLi0S9V8MzW Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Akinobu Mita 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. Signed-off-by: Akinobu Mita Reviewed-by: SJ Park Signed-off-by: SJ Park --- Changes from v1 - v1: https://lore.kernel.org/20260603112306.58490-1-akinobu.mita@gmail.com - Collect R-b: from SJ. - Rebase to latest mm-new. mm/damon/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 3dd2750c2ef20..ded76719e8a14 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1362,14 +1362,14 @@ 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; } -- 2.47.3