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b=iYrNgWHp5tLzOz/3aqLuMzSn23KTXvrapVoPTw/yBJZ9qbPiEl2mHbD2/7KAcG5yY OtNwvMV/Fwcq57a0D/j1GsDkRO11Pu8gYvB/B9ZWsulVGKEZSRTY/bUwXRmkiq0huD H3hXg2S6vvUgJr3xopSpNwdarO45CgJMaYTDukmpkKOrfPhs+yjrQH0/56+zA9Gawn RU9BVYhxxSdiR/5sVumDvNc/n4cgDnasEYDKuKPdAmdTRKx3UxAuvDXtsKvFoNRVbf Hhiga0luIB/6LHOYBajYCmFXXIC7Ojxb3Cu7sUdsRddsS7JXNn+auf6f8CPBCFe1TX J1ME36DrUTvTQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 02/10] mm/damon/sysfs: add pause file under context dir Date: Mon, 27 Apr 2026 08:12:21 -0700 Message-ID: <20260427151231.113429-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260427151231.113429-1-sj@kernel.org> References: <20260427151231.113429-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 57E1E12000B X-Rspamd-Server: rspam04 X-Stat-Signature: 6478s4gehc6zp3g8i6gpokmbbu66w4tq X-HE-Tag: 1777302761-432870 X-HE-Meta: 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 V9D7cFPG 8o5BwKhee9hCBjmMYGOo5r1KSXv47+3+aKtvJBLceo/9i3eKLf/GlykSVkjSCW3mW25o9QxLIXOdWZj9h2dBHVFoRl766+AAxNef759SwZGew80HUCL0V6eEIhUi1XQtSY7fzwbEVPj3kcDctLNpYQel6M05W2PvWu9/ol8KyuHtsPcvK9zN0Ks//tzch2ESt6fxk 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 eefa959aa30ae..d5863cc33d230 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