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b=WBsgvH0EWMMjf9mbnDY1TkxSj6Yc5IvgBOeP6z2tDe0akHiqMKPt4R/5kh7QYTd8H nHvVSzwRJ160hNmD9i4x9kMEalX7KimkFX3jv/4gEO6bq7XzwaOcdR89S9DWSx2Q5Z QbYXdTJWLmPhUssnB668gR74pahm7gGjteN4GjOUH77ngXv5fki4u1H0wD5zLb9BBf hl0IteuyWdDpjEi7w0EGVtKlNK6/mS+7tu2PBzDBsW2YzIB/EfID6Xmd7ONJPs4qtj tgwmA3Q0pYrKdFEWTyUKe4y5hmdC/43g6iB3CwmmOQ0pjcx0+nt8MUnt6W8liH9hWi TDRSZPQqe5orw== 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 v1.2 02/19] mm/damon/core: ask apply_probes() ops callback to set sampling address Date: Thu, 9 Jul 2026 07:05:40 -0700 Message-ID: <20260709140600.90950-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260709140600.90950-1-sj@kernel.org> References: <20260709140600.90950-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5DBBDC0007 X-Stat-Signature: k79jtz5acdhpe5ihbb58osegox34qziy X-HE-Tag: 1783605965-369179 X-HE-Meta: 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 iecNjWoG MmBjjDc2evbNsvjWMDuBJme8aMQcxLbmH1Gx4LQN17tl/jJM2rN+zaCvnFgyvcXuFQMlF9Y5IykSJNbVN0n0KgI6nYc6R5PEAlGaKls9ZAuFuugkkmpCZqRczNL1hRXwgnAAaF0/XUEego85NPeMGgGRokpDrORxjt45o8VN5AH5EqvDNuy4aTmimZlG5R/kslw2Cs9YrImusBp30TU5Gp85dZORrQMLr0jZW3Clj7Yf1pXf0tMd+V2NItz98o0afIv/b2VZpjgp4sECT1H2l76obNA== 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 d8251c83e6e55..3c2a4d673bf62 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 327398fa4ee56..9fbea6204520b 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -3692,7 +3692,7 @@ 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