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b=n2jOlGxKZnItSh90/CHwHf/3n40YsKYeI9L/w7x5ASEzPnbBBSCpFKdwahiYgoVeO xvqprGtmJD4jplV0wQSYLyL7jEFiGAvX8V832u8sVPSvnARMhUY023Nu/ls/MHlPZf dt4o6t9+fTL4hXy1fm0pSNWIimu6iRrL79/YtqdWxViOExCq40k5Yt/kUwc9hLVdeC WiuxaHWn5HQ3iING4xC5x89Wn7jnK53PZPg6OmGpq9BXywTInLRjTFCo7g0jNApELO YA2mGnLf6Z1SuTzWoFU3/3If7etKf/7aHS4Kz1mTUfC8QtH0lGuEe3Uce4AmcvT3f6 joe+9vz2UYS4Q== 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 v5 02/10] mm/damon/sysfs: add pause file under context dir Date: Mon, 23 Mar 2026 16:15:27 -0700 Message-ID: <20260323231538.84452-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260323231538.84452-1-sj@kernel.org> References: <20260323231538.84452-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: o9mfdmgo3njpgwufqbp1wgobuamhfkmh X-Rspamd-Queue-Id: E0880180010 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1774307743-1008 X-HE-Meta: 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 HZKkHc6g cI2+02ZOdWGuBFvMvuX/U6cOTc315Gik7mo9jd0vwxzyncGtOhvhUv729yBpnvZ2XySwEKwPA+KBa92VcQRWze1GgNljHJ1qvCLGmQ/pZj+57QU+3qNG0PKLR3ounJP7BJzmwvfpSBnb5FCzTbAPA4AaO2k5HQT7TUVW+3vrtD2Y/m1UH0avClDJ92jArYX6WohtDpEFwmkEslJtXfhsk4uHPp4af/0/TnJOP 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