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b=mcWBUA0v1S+nQq/xWMdSkunC1QXnJA9K5/R6qIdXOda8x4pe3Qw65DmIG1X0zFdb8 ECow1YHbNKW6fBpHW0z2V26PgttJJ5a+ZJmp/H4V/V07WmvIiIUDw2h6RM5/o8XbBd 7VJy4tMFPEX/VVf3WiWYeUchdUHmSigjbglemysSLFuOETdvGejrow3zouTXLiiZi+ 9hFyFeIucYjVYph+ndoYqvE8mt74zqts4HKe/7Zk/dEltm/J2pvDEma0RMjMEzC5kz NuhQEBTjEkqqrLd9vyib2/WKQL7YljFbtmvzzg1fRwD06Bg9bfsq7wEGN8kDU5F28i Wn5luw/D2CKrQ== 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 v4 02/10] mm/damon/sysfs: add pause file under context dir Date: Sun, 22 Mar 2026 08:57:16 -0700 Message-ID: <20260322155728.81434-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260322155728.81434-1-sj@kernel.org> References: <20260322155728.81434-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 7F2701C000C X-Rspamd-Server: rspam07 X-Stat-Signature: jh9mg6wh7nbe4diwsu8ebrydrnk4ingx X-Rspam-User: X-HE-Tag: 1774195059-830239 X-HE-Meta: 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 63o8teWQ 4S7zDIm8tQM+neOIiECUtAarzxqz30mbTlLoRDTLqOthU04gEJh2CfWFkjPinNDSjAJaINXTTNxTEpSHIqYJlxqDrf8SemGR2f87j7Aokya3Mj1NFFQtRho+ZT8XnZgGgSOokoJRoGx1mYJRpEQGl5AF2KsxCNLYiLsD7D8htCfmMBJydDNBBlYYddiwvP0s0ebK/NMI/G1xIrbU6zEVuSj/ABIvRgDuzbSoW3iZgNtVBu3k= 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