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b=cdPmNLQb0JS4kyN0C0aSoPXZcXcC7pKfrTP1MSY+OtHS9al9RJAd+Nbyj+Ik3k5BP IRERY4Z+6ATXkmOOoOJnf1rh8RWQCPK63AHKeazoV3/Q7WfHtEaNhC+9SrCa7dUDXg TZ5z2GaNy1bgSzGGz5vjrAXGDvGFGyDRohfks2I2k0Q8wGeB5db/DMSWpDr+FpLlM1 XE8atbc/zYtR+0xbpIBWXV4+W4FqTr/y/wqf8AzikmNXDYmFhRmkxDlL9xvVfNJow6 UGllFv5ETbtMBvDmJ7Dc8ECbu11DSX99uofXonsxVWsJySVQPlg9LGroBt1lua3RHV S6ZYQTE58i+Dw== From: SeongJae Park To: Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v3 28/37] mm/damon: extend damon_sample_filter for threads Date: Sun, 7 Dec 2025 22:29:32 -0800 Message-ID: <20251208062943.68824-29-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251208062943.68824-1-sj@kernel.org> References: <20251208062943.68824-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: nzntp7smhq8tzd5scqgdqf1ddyro4137 X-Rspamd-Queue-Id: E5CA210000F X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1765175432-83783 X-HE-Meta: U2FsdGVkX18mQtv7ZTd85H1y3Wl7HJx3CYZZbWrUND4JMszJPfng4RopQYOnOc8FgS2yHn62Y34UFbB25jRq1VuKYKNwZ0/LViU6D4pb7nPHJKhvhd8kW71brsF2/WnwAiP3+lRd/xAGMmHatdp0HPn73BejIYCDymyYUunnd5RBkzYB026oTs7Ky+fCRkQHWTvDfIp5Jl97gcGrdsGVljIMS0JVO+2r36QrM+UbwPjXVwmB8tZ2VLEI0CvJwTrGfcYI8MflfwgHtAf4/uWWjUxf1IXcDkBO0J/per0WNAR/rIPRqI8YT+nH1y07UyPaIr1mFq9lLZ+4baCMn5BbvYBFuXwuzFg5JKql8UdswiE8KnXlnxz+NU5TtoS47Vfl8nxAPKeoY6qhzYy5qnCTD8s+ajrZeksYMN50Vf5lXy/r103lD2wUF8uj3u5iNRg01BLH0dC07YDx0sF9Z10JuuWK4FS/GSeNfKBc37+Dckk73SsDzBLnkJf6qQYbf0rMICCWhRp/oB9S27Gy+alZfRkQ6FGAeZeBtuQDmptGB4Vtn1n1/nE5iIavPiSucGo6G57JpJ1phbes6MH2CgXpEjVUlgk3FuHohIGo/0bbDsfJ7oH0DWI8mcnzcgTJfbpiI12o+217S6hD82zA1zAH4qnoEwbG9vAHGl6ehfZX0dQoSc5rXwBU7SreaVMlxHFza4AauSdAo67ao6PF41a4lnSELHvJgAgMfM0kgZCz4+RDk7PK0i+fUnLg285s2myS306kJ1I8YEHGLPa+H+F0tzfCMilZ4DgeemtDf/yca9NqsB7sarfJtW8+SsZltNBZ23dCPb6hh6fK/Jng0LxUD3mV8lTGN7DQWsac4maawehGAiZzZ+tFvjO5wgpfvUCdN4edWqAhr3PFme5Sxka6PR7C+Jc7xD1J1+Mk6qykWE20FLW/Tc/1b2BvSMQzygc+ixzJXS0zl68CV+poV3w Tl4BwsoM V3GjGfPGKeToO/TeEou7GKo2RF0UoX0LSjCK43gJhOdZWjFCXs2sScu+6zEiQC2e59HAOL16i6dyaWmGR9MY8uIZG8XlyPjIBXoKsm1xxh6FOexpnxEdUqVFX4Y0sQAWgn/hID40REZyUN66b3JWKZd3XcBU7H8By4Dum/2XMSErdKS9Fk4uxi2WsJ/34u+JwTHJ72lzzTZT3VvZsVIIB+lR2ScQkrCZcl36djLrToD3X76NUmjlWGS8/WmVVANweR7ruWTfG/vuNQWoYzUKT2sqgUhjTcLgyCy/f6A27aOThF3gO3+TCN8xiVMaz9IysN9p0qwxOymaGDicFmNvW4rCAPpkinpIp7VzF X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Now DAMON access reports could inform which thread was making the reporting access. By filtering the reports based on the threads, DAMON can do per-threads monitoring. Extend DAMON access sample filter to do such filtering. Signed-off-by: SeongJae Park --- include/linux/damon.h | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index 80332bb2b73c..e3408280ea72 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -787,11 +787,13 @@ struct damon_primitives_enabled { * enum damon_sample_filter_type - Type of &struct damon_sample_filter. * * @DAMON_FILTER_TYPE_CPUMASK: Filter by access-generated CPUs. + * @DAMON_FILTER_TYPE_THREADS: Filter by access-generated threads. * * Read &struct damon_sample_control for more details. */ enum damon_sample_filter_type { DAMON_FILTER_TYPE_CPUMASK, + DAMON_FILTER_TYPE_THREADS, }; /** @@ -801,6 +803,9 @@ enum damon_sample_filter_type { * @matching: Whether it is for condition-matching reports. * @allow: Whether to include or excludie the @matching reports. * @cpumask: Access-generated CPUs if @type is DAMON_FILTER_TYPE_CPUMASK. + * @tid_arr: Array of access-generated thread ids, if @type is + * DAMON_FILTER_TYPE_THREADS. + * @nr_tids: Size of @tid_arr, if @type is DAMON_FILTER_TYPE_THREADS. * @list: List head for siblings. * * Read &struct damon_sample_control for more details. @@ -809,7 +814,13 @@ struct damon_sample_filter { enum damon_sample_filter_type type; bool matching; bool allow; - cpumask_t cpumask; + union { + cpumask_t cpumask; + struct { + pid_t *tid_arr; + int nr_tids; + }; + }; struct list_head list; }; @@ -823,9 +834,9 @@ struct damon_sample_filter { * that to make higher access pattern picture. It can use multiple sampling * primitives including page table accessed bits and page fault events. It can * also filter in/out specific types of sampled access events to monitor - * accesses of specific types, such as access-generated CPUs. This struct is - * for controlling what sampling primitives to use (enable), and what sampled - * access events should be filtered in/out. + * accesses of specific types, such as access-generated CPUs and threads. This + * struct is for controlling what sampling primitives to use (enable), and what + * sampled access events should be filtered in/out. */ struct damon_sample_control { struct damon_primitives_enabled primitives_enabled; -- 2.47.3