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b=eJy8/cVJ81Ae+2eCoSi4N8ohqYC0QqIvbbjba8mrFJOd/qQkvPhB4yjhvbIwjqbhw UCheQXHCUszPehMT6MEus2ROhKegttMtt/GHOEqMmRsEVVepNcVOelR8fRxJlo8alI zLi+heVms3v8nv0gnstcOKjaIDDEHeYkUeEfcvjpdh0QviJxJmy3anIhXhDULEN7en W6/vEXumqA1yiJyAH9k0Cr5KmM+h73tGLjLQtG5W7KKrj8Ra11FWfQJA9e5IZWKacs oB/rSPWu97y/lKHb+dJJqFovmqzkP5fkYSXxESmlGXjx+W2KmSEFSskTYrndslnW6n sMbIwpOvcWszg== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2.2 05/28] mm/damon/core: introduce damon_region->probe_hits Date: Thu, 14 May 2026 17:44:06 -0700 Message-ID: <20260515004433.128933-6-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260515004433.128933-1-sj@kernel.org> References: <20260515004433.128933-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: BF4782000C X-Stat-Signature: 5c6jyopttzidux55mgyghpu7cay4cckg X-Rspam-User: X-HE-Tag: 1778805888-832816 X-HE-Meta: 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 Da78cUhy nXmY2crsNJVuaV8nD1IXWomcOKgiaOggzHYEOjXYM055Qu4xHQGufLgivvdpRIxVJmiCk7UJtHi/gIH5LlR/Fl2NeIQo8G77sKUoPjas0cHWc/4iaM/rwTWnNbj0D9vauAZSDIxz+682tjgu+DyNqwUQZdrDLK/nP+hXK/xoWSHsEA9nFYiQsrBIt+vyILJwzD1SRGlvkGD8Bp9U3aVEZRgn7LQrTcQELM3A37dRZ43Cd9Emex7Pm+tSfl/Gs1oApEzXPCuGS5xQzkhHda9kdO/GCvQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add an array for the per-region per-probe positive samples count. For simple and efficient implementation, add a limit to the number of data probes and set the array to support only the limited number of counters. Signed-off-by: SeongJae Park --- include/linux/damon.h | 4 ++++ mm/damon/core.c | 3 +++ 2 files changed, 7 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 9c2576f103767..bf78ad849a9be 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -16,6 +16,8 @@ /* Minimal region size. Every damon_region is aligned by this. */ #define DAMON_MIN_REGION_SZ PAGE_SIZE +/* Maximum number of monitoring probes. */ +#define DAMON_MAX_PROBES (4) /* Max priority score for DAMON-based operation schemes */ #define DAMOS_MAX_SCORE (99) @@ -52,6 +54,7 @@ struct damon_size_range { * @nr_accesses: Access frequency of this region. * @nr_accesses_bp: @nr_accesses in basis point (0.01%) that updated for * each sampling interval. + * @probe_hits: Number of probe-positive region samples. * @list: List head for siblings. * @age: Age of this region. * @@ -80,6 +83,7 @@ struct damon_region { unsigned long sampling_addr; unsigned int nr_accesses; unsigned int nr_accesses_bp; + unsigned char probe_hits[DAMON_MAX_PROBES]; struct list_head list; unsigned int age; diff --git a/mm/damon/core.c b/mm/damon/core.c index 15f2795a1156f..f6b4beb4b8ecd 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -225,6 +225,7 @@ static void damon_verify_new_region(unsigned long start, unsigned long end) struct damon_region *damon_new_region(unsigned long start, unsigned long end) { struct damon_region *region; + int i; damon_verify_new_region(start, end); region = kmem_cache_alloc(damon_region_cache, GFP_KERNEL); @@ -235,6 +236,8 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end) region->ar.end = end; region->nr_accesses = 0; region->nr_accesses_bp = 0; + for (i = 0; i < DAMON_MAX_PROBES; i++) + region->probe_hits[i] = 0; INIT_LIST_HEAD(®ion->list); region->age = 0; -- 2.47.3