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b=SAIdS8hTssa89JMZV7IQawnF9hbg/k0YUk20mV/wVERdNlsMEk6/MeH9UMI2RPnwx BRRP9n/9EzQSAdD96+HTSicVA60PYABIEnlxD42tPu1Zp7U2RvJEbLMN1YKt66Yvu4 MIL6iD6p5OWF1uF05R7YmsSfu+BRGUsDzFvueWMXgvTk9wcsLq0zAKexzZP8ormfo8 HVmDvxF4qY6mfS+CFs2MZxF34wm8kUNwMYDXo02nmLORCrAhE3CIALU3jT9KXejS2e gkQRYAU3xgXZZQyjID4gCR+/lMGvHeSZ9/ktVjPttub+MRkDVknwdfqrB+eSy+4mza PEHLgZ8dBSQtg== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.1 02/16] mm/damon/core: ask apply_probes() ops callback to set sampling address Date: Mon, 6 Jul 2026 07:18:56 -0700 Message-ID: <20260706141912.88445-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260706141912.88445-1-sj@kernel.org> References: <20260706141912.88445-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C194240010 X-Stat-Signature: xiq9e1ijkx98nth3xh1yr5fhmyckcz8p X-HE-Tag: 1783347561-235728 X-HE-Meta: U2FsdGVkX19xnvxu/Pr2iI9cIoKHuGC7CFQ/wCIMfs7RMyaAvGmQRJqXIgdEUf7Y1hUpY8uaETaFR88+P0COYS+1/uIrLYfkRr1BogFAVRJZce+ryzpQ0nfaSCIy6UfxAHUwiyrgaW9yprUPzkvCgh1T9Exp1pVGTwXRBzAGP/WfctwqUYh0kU6VAv0hFa6ct+hpLk2JzX7Rbm++cwjgauCr5jGbQhhqeQ4D4ww3RQFqtV7LU49HDWg2YEIN5tfFIUa10FTPdGPr5egAk+9KSfYv+zjdGRHcbuKr+ckpcTXlA1aVe0mLLYEVoQK1TJpHr+BZRlnhL/xI4EGspUnxBvoaIC1HvCp4w32AZAWJpsfdCNFNefxDaaMnTGVYlJgf1jKN7A4UMGIoa5KE+8VQEW+fFcyBCnDVTGqV0duCWNYXH6CTYxZ3PlHuOsqGk9wVp6vTya9T1v53+P+OG7WoaLKgg6gyPurLXdbel2gYntgMUqpH20f0S59Dw7IR4eekIJDitMN2BRmv0lxuTWAf+OY1mMiQloT8PsytlsJpGX/TC+0xsQV6w8U+nO78SUpHARqEP+ObjuxBm4WrQMZUJt/OO37yg40ije5r7VcFfsLqpHDTyVXa/AkJ5HfrBB1wr8UyOEv/Jhv+a3aBcYorOFCmubtB2FnrcJcyi3wvfKoljIcOjkyPPxeKPYgbckb1ycNaiLW2stbkWYTeFarA/IpxXhXT6cluXOSTfmvRw0i31ZOKlZfaFwwJ5uJgSB+Vjf+IxnAnFx5o0EM7msHVHOWN6cTvxE4CqSFrFj5Jh3RnwK/9LQzbfddEZ/KTdWwU5pzXRNijOdHvI4hboO46g/Y/9HGGubn7njlxzpJqcVNQOj+ye2hcqBhcgk9SDMVXP24K1bAEtVg1WwkrMi3gACwQGqSbfe7NpuBb8Ch5gd4HYzDbQ9E87/gmdNaJXDZ/Wy7RuqQVqBQkaDLhDGR Q4pXRfM0 yXucRbk7eRC+w/CbtEAXnaycoCtHjkHj7RkgawKDhFB4yYwplWkug296Ycx60rNHR5ru3XrxrnpL8nZBnhN9jjyMHB7ML8+JnwkLlWQE7QzLrMyb6RdGDbB09GzGLOO5UtclF5NdfzlbRNdylUSna5M5mwKas0yf5CWt6ffuFmQeZMR1lz4ekFCUCFlW2ZpZDKR+0x6b2gruLWPMMO2OViLul2G4/MplN4J7w7qOl3cEG5SFH0J1toW0G3ifv+qTqcTz8wsvIosFQnfdChQxZR9paRw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: prepare_access_checks() DAMON ops callback sets the monitoring sampling address per region. In future, DAMON will be able to call only apply_probes(). In this case, applyy_probes() may need to do the sampling address setup, to minimize unnecessary regions iteration. Update the protocol for the request. Signed-off-by: SJ Park --- include/linux/damon.h | 5 +++-- mm/damon/core.c | 2 +- mm/damon/paddr.c | 2 +- 3 files changed, 5 insertions(+), 4 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index 7d0a920fe4b83..4aa606f691f28 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -647,7 +647,8 @@ enum damon_ops_id { * It should also return max number of observed accesses that made as a result * of its update. The value will be used for regions adjustment threshold. * @apply_probes should apply the data attribute probes to each region and - * accordingly update the probe hits counter of the region. + * accordingly update the probe hits counter of the region. It should also + * &set sampling_addr of each region if ``set_samples`` is true. * @get_scheme_score should return the priority score of a region for a scheme * as an integer in [0, &DAMOS_MAX_SCORE]. * @apply_scheme is called from @kdamond when a region for user provided @@ -665,7 +666,7 @@ struct damon_operations { void (*update)(struct damon_ctx *context); void (*prepare_access_checks)(struct damon_ctx *context); unsigned int (*check_accesses)(struct damon_ctx *context); - void (*apply_probes)(struct damon_ctx *context); + void (*apply_probes)(struct damon_ctx *context, bool set_samples); int (*get_scheme_score)(struct damon_ctx *context, struct damon_region *r, struct damos *scheme); unsigned long (*apply_scheme)(struct damon_ctx *context, diff --git a/mm/damon/core.c b/mm/damon/core.c index ca5c3f3e45fc6..7c0184cb78a50 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -3675,7 +3675,7 @@ static int kdamond_fn(void *data) if (ctx->ops.check_accesses) max_nr_accesses = ctx->ops.check_accesses(ctx); if (ctx->ops.apply_probes) - ctx->ops.apply_probes(ctx); + ctx->ops.apply_probes(ctx, false); if (time_after_eq(ctx->passed_sample_intervals, next_aggregation_sis)) { diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 6172464981730..b13bf7c6eade3 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -166,7 +166,7 @@ static bool damon_pa_filter_pass(phys_addr_t pa, struct folio *folio, return pass; } -static void damon_pa_apply_probes(struct damon_ctx *ctx) +static void damon_pa_apply_probes(struct damon_ctx *ctx, bool set_samples) { struct damon_target *t; struct damon_region *r; -- 2.47.3