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b=dYUjacPbZZ/tHdeR4OPPRLF5Z2QcyEOaEeTGWM2oJ7nYrOPKap0koFyiotrZXwILb 7u7zHxR1nef6GALCZ/w3zkkdT3KNbwoxicynfl797ksVEQfx0iXlToZZ+qPsIyGdco gem+LalKmO6ZYTqEkMsTm6jLr2mWZSCRG/JR3bQkP0annKIEYSRJeme69wlBp3JJlu 2jxqZ8g/tF2iYzOwuZ3NYZUwtFIaifMZCLKltuvx687FL1ns7SvgBHiuPVycndn4vD /gjuld0e3Pu7zUrKVkN3dci6syDmqkw8vwH2SuaMtDR9jDIO9CqaJ/EHG7T0Lj7jck 3kp5/o67gFw9g== 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 02/10] mm/damon/sysfs: add pause file under context dir Date: Sun, 15 Mar 2026 14:00:01 -0700 Message-ID: <20260315210012.94846-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260315210012.94846-1-sj@kernel.org> References: <20260315210012.94846-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5AC9C1C000A X-Stat-Signature: npck9twpe8hiyoj5zcusp9g7ais3nqr6 X-Rspam-User: X-HE-Tag: 1773608424-118606 X-HE-Meta: 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 cODtmWIx bjZ+wV7+JFgOjG3ulBG4Oo0lpkYMwPz4/3JKr0Oa/+BHpSlKmoApYU9Ee1/x4ZXloM7VESbLfypPEJfpn/VBChOOq+WtmUABfUoHzyQoD6UUV08yZDNyi4u9UC4W3JIXEW1+m5/1HGL/+TV74CgazhkkxbHiQBMOQ5ra06GEOS3lCPRrB+yCGtbwqr/eB4s8vTi7qaNahP+PKdKZyC7ncbKhK4zsFTZ2MuWmU 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 | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 576d1ddd736bf..4cbb8b9aaba3c 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( @@ -1053,6 +1054,30 @@ 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 +1092,14 @@ 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 +1499,7 @@ 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