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b=RB/sw3oyJZzZe3oe/2j/45aVwyCuxSLgJi3y2xBXmpajajlFV/N42xDccH6B0Bics Utq+GYHtiuQYm+upce6/8fcjzApMvsgXe48QnxS0W2+Z6WqzQoHyhuXmnk5WyH6Spq nsPOT/XnwG5uzG2gAm9xAU1xXg0n9yNYKvF8OFba9jeqaG+hPb6ZdeuEg80ax++8DG KFKSqFNzOUpd9qBIM59v+IP/fTKW1AzwEEdQD9F45whiSPJexdhRMaUH3lxAAJpnYL NP8b7MsG6RhGe5oBzMN1hUUf+nfrIf1N4v62mqVR6UY31boEFpEe8lS3gm33ooKi9V XPON7qvYMTf2g== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 02/10] mm/damon/sysfs: add pause file under context dir Date: Sat, 21 Mar 2026 11:13:32 -0700 Message-ID: <20260321181343.93971-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260321181343.93971-1-sj@kernel.org> References: <20260321181343.93971-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 564D7C0009 X-Stat-Signature: 8q7r33irbaq88mjnaes5bxrqakc98ni6 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1774116834-959236 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add pause DAMON sysfs file under the context directory. It exposes the damon_ctx->pause API parameter to the users so that they can use the pause/resume feature. Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 6a44a2f3d8fc9..51893abd09472 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -866,6 +866,7 @@ struct damon_sysfs_context { struct damon_sysfs_attrs *attrs; struct damon_sysfs_targets *targets; struct damon_sysfs_schemes *schemes; + bool pause; }; static struct damon_sysfs_context *damon_sysfs_context_alloc( @@ -878,6 +879,7 @@ static struct damon_sysfs_context *damon_sysfs_context_alloc( context->kobj = (struct kobject){}; context->ops_id = ops_id; context->addr_unit = 1; + context->pause = false; return context; } @@ -1053,6 +1055,30 @@ static ssize_t addr_unit_store(struct kobject *kobj, return count; } +static ssize_t pause_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct damon_sysfs_context *context = container_of(kobj, + struct damon_sysfs_context, kobj); + + return sysfs_emit(buf, "%c\n", context->pause ? 'Y' : 'N'); +} + +static ssize_t pause_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + struct damon_sysfs_context *context = container_of(kobj, + struct damon_sysfs_context, kobj); + bool pause; + int err = kstrtobool(buf, &pause); + + if (err) + return err; + context->pause = pause; + return count; +} + + static void damon_sysfs_context_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_context, kobj)); @@ -1067,10 +1093,14 @@ static struct kobj_attribute damon_sysfs_context_operations_attr = static struct kobj_attribute damon_sysfs_context_addr_unit_attr = __ATTR_RW_MODE(addr_unit, 0600); +static struct kobj_attribute damon_sysfs_context_pause_attr = + __ATTR_RW_MODE(pause, 0600); + static struct attribute *damon_sysfs_context_attrs[] = { &damon_sysfs_context_avail_operations_attr.attr, &damon_sysfs_context_operations_attr.attr, &damon_sysfs_context_addr_unit_attr.attr, + &damon_sysfs_context_pause_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_context); @@ -1470,6 +1500,7 @@ static int damon_sysfs_apply_inputs(struct damon_ctx *ctx, if (sys_ctx->ops_id == DAMON_OPS_PADDR) ctx->min_region_sz = max( DAMON_MIN_REGION_SZ / sys_ctx->addr_unit, 1); + ctx->pause = sys_ctx->pause; err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs); if (err) return err; -- 2.47.3