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b=AvCucv5BnfwStN8bnkbrx8qW6MAFLmXHFk8Lz4P3dUPAmmvG6cRLR9twBgi22e7yy blKIN3ZS2qREWyurMfrguoqHa1cu14dobPyOvvrJO4EWFBX1pkKDtxlH7ikwZ9IKD8 ahd6Us4+KjL3By0ez9gIEQjIosh/TKnxb1uR8Gm6NZ7MTxTvxpdzjMa3nCBabFfTsT ivmC5sIKc1VmdxpRIvNwzVZiwGKYmrWc5pAyEzCbSH8nN0dxzKrtmi5IB6l+a6wizo skSwbszm/+iJqfOxusaJvqvtKi/1MrO+XRrR+2qICEeBML55B+zvmZsElPRmhhaoBK TRAwQ6xiJwUTQ== 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 05/28] mm/damon/core: introduce damon_region->probe_hits Date: Tue, 12 May 2026 07:36:20 -0700 Message-ID: <20260512143645.113201-6-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260512143645.113201-1-sj@kernel.org> References: <20260512143645.113201-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 8BD2CA0009 X-Stat-Signature: iigiodt3x41878w7i31eh9wqsx9sxxrb X-HE-Tag: 1778596620-207337 X-HE-Meta: U2FsdGVkX181MdrFPkH7iIYPIis+s52ydeJcjZ+mNYNhrREjfsh6I4BduaJ6IaZOfeSouzqTn/VpKdtHbRyoKseBrxz2BYOrWVryjqxcC/had4I7II1HBsvPf4B2jr5iwYy0/ObvGqFZWLaF2e7FSZvb1XOhbZ7BSYu+CS8ONk9ymJe7iHflw5WluMvmSrweZ4sVGbsu/ETHL+HjcvLx2+NLf3BPFy7AnowHXq0lEapCo3EoU6yIYz6SEfvJgFnbiDenJfp+cWU7yw0F8+u9Nw3aTATvOukguAoceadIlloNj2m+8wfnZ6346Whyw7Rft/2kOzD5zxPZRcHhRfVJjt85OtRBR17N2JJLVljF0E4l5JfuGIaoj3HVQwuFmcMGV+WdnixX/IDd1hCBjI7gb6CtOWAfG+xi192cCTUN+1dhO7GnsMyOc6YVNPgQoxk6i6ghaY9KoahmpdIeTPzt6GAtD1ufCxkJd2AlY7xR3rzMqcDETjef0b2NlqcnazuMfb9d4YMnnsXgJ4biSr1sOxxeJQMhEsMg6X5ErBBw4/V9A4/kdR6BqpxkocVsphKHUH7fttSyiqUQ+MXWTAomT8yHuXggStmXQ7BhmV6rVyuy4dCvAbhuKMlc2Xn7XqPm0v6k31cxZBL/U6NDcTFU0OANX/x0+FLxPv3iioxLBOaAnOQxHWXR2k9FtWNIQaN3IhC/AWrT6KJF4qw+GFxysqZSY5zbzzlCTfvxkD2ATRCYE1B5hD8FgAn07aiycRylQwF2KsHSnxr1WlPFCXmvBk5tCcX+dmYpdRAtXL+6oxEAXMfJOVgtsY6J2ebkheGBGBw2xtv2n4du5woZnZTzHaqg7XYmJnkiKuxxKstoAmty0Gcie365NXKDJTX1Ifh9i0FLGFUKTZTLUBB3OYv61oshTJkDz7EP4hZwNxfLYub24do6qcU1G0mWgj53a9PeOu9TBHtpjcR7CDtTFBU V8GCzEKc 7nq7n9mJYzRJm7dV3F8qbN9DSJrVfApbagSbWpaQu9HgNXg80bxUjypdRlK25C6OydaTdZj+bCKTl7gqiDAQC9QTb6YkLI7ugUB57V7ZiTr/k1wecbxstUySzRud6dXuTBxoL/52c3SN/rEJTaiZOSQ30f+E3JwT3AvEWcf/7PlnAQnp2XO+6kaBbk0BSyCH9SBl/FX+dKXuWMAi8x1Jk7DF3VC7noaQxNB7lPm8J2lPHyeRYIZsvE9lpGmKshgegaP+A32b2f+ndo//bF/8fYImzJQkuts4UQ9WUvXdZS1L2pcjtyr6s/vK83/I5wyS+zgon 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 95b2c508a63ea..19b780bfab051 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -17,6 +17,8 @@ /* 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) @@ -47,6 +49,7 @@ 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. * @@ -75,6 +78,7 @@ 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 240cae1420c12..72acdeb8c478e 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -229,6 +229,7 @@ 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); @@ -239,6 +240,8 @@ 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