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b=R3xmC6P6OTHd+Fs+mCFy/jqh14jFnG3Fl4q5rjQ2c2rio5VNHnB87XL87/U51kLyb nFxYMDbfULAUqYw2HCA0U5ebdHOsRLEGimnW1d3dRsf0aQvqJKcmjXTsWzbyC0UdZL ldsFPoY6Vnvy4iSeU99JIFEyvIHPWWcNQFSR7Ggl5DrON5/LtpuxRE8s5isI+kj2O4 ev/yAh9ObnSHMXiFlOGBHnC7Byd1MmL4+Bad4KiO1KiR+tfqXBufseSbcauIon5KD5 yWruBU376m3NO9oWFKi5nzwtHZxkEll6vXNu65GvcUTYv6ZomuH5sqP1XCqr134E6l bUvoUggz7NKWg== 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 v2 02/10] mm/damon/sysfs: add pause file under context dir Date: Wed, 18 Mar 2026 22:21:45 -0700 Message-ID: <20260319052157.99433-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260319052157.99433-1-sj@kernel.org> References: <20260319052157.99433-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7CBDA140002 X-Stat-Signature: wxzff9doxjyxm3oykpkfddqayexczcih X-Rspam-User: X-HE-Tag: 1773897728-747128 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 576d1ddd736bf..7bd42dd8c4a73 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