From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 121803DA5DC; Thu, 9 Apr 2026 14:21:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775744519; cv=none; b=J/l6QCWN5JCo+mWulwK3TgoU7rmSglig1h4swmmAywK0kzou5VWCi6ryE6NQ/mApmVlF7Q9ExJLNS432DbN9KLHNTx/qC6ksG1f8b0d48MW2kSCSW8Yy37g/c/NY6vlXDq7P8eQyylYnOzsHZAofY+XP94SgV8BHqSF0LtKgOTI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775744519; c=relaxed/simple; bh=F/M9rB5L2tN6LoRT9CXC/JolkzvZc5e3+oNuxF0asr8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YgnA1SDdCJtXj/7RA9zbqSNtg4AEXjykotjt/ZNdXsaNPt8vtlaaOUC9DxOku4y6feoExg0ZFrW8Ukf9y0k+j3oyLzcOYfSIr2JrNxFRGwpsIiWcBRYoDtLFnp9un5RHKg0E1HmDrUdqbyXJEzRWhdJQzLCLopk3urb0ldN4qUE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lUuANX1y; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lUuANX1y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5CC6C4CEF7; Thu, 9 Apr 2026 14:21:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775744518; bh=F/M9rB5L2tN6LoRT9CXC/JolkzvZc5e3+oNuxF0asr8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lUuANX1yzKuXdAUEGvZuwhRVRAnJcP7DD+EwoCbI5QOBLaH6vgyQjY0tPfLeo6A1z mLWmc0yVMIMVdV6KGItV0gxOFqSJ9DoG1aqlsDBIoDqU5fJpMrXH4mdVE24nAaNv1p wxQlQX9BAKg6YNCV7QVfNmnfSc5TgpSmd5JHfsQ4WRtKCbmxY5Nv08sfQ5Axw5sSzz vByLAu6gMWFocxSt6kNabl/b75O0Ay+3tK7+vqc0j842EIMl1gxGS3SbM3DT07HGo1 TlX/fCaSiiz9YwBPiZ1WQVjhmzT5SzLwQ+83ERfuyvcyR7eGVpniCEhhz3RHk5lHPZ Mtrnby5cNxhtg== 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 04/11] mm/damon/sysfs-schemes: implement fail_charge_{num,denom} files Date: Thu, 9 Apr 2026 07:21:39 -0700 Message-ID: <20260409142148.60652-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260409142148.60652-1-sj@kernel.org> References: <20260409142148.60652-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement the user-space ABI for the DAMOS action failed region quota-charge ratio setup. For this, add two new sysfs files under the DAMON sysfs interface for DAMOS quotas. Names of the files are fail_charge_num and fail_charge_denom, and work for reading and setting the numerator and denominator of the failed regions charge ratio. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 54 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 5186966dafb35..d5bfba79f105f 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1489,6 +1489,8 @@ struct damon_sysfs_quotas { unsigned long reset_interval_ms; unsigned long effective_sz; /* Effective size quota in bytes */ enum damos_quota_goal_tuner goal_tuner; + unsigned int fail_charge_num; + unsigned int fail_charge_denom; }; static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) @@ -1663,6 +1665,48 @@ static ssize_t goal_tuner_store(struct kobject *kobj, return -EINVAL; } +static ssize_t fail_charge_num_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + + return sysfs_emit(buf, "%u\n", quotas->fail_charge_num); +} + +static ssize_t fail_charge_num_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + int err = kstrtouint(buf, 0, "as->fail_charge_num); + + if (err) + return -EINVAL; + return count; +} + +static ssize_t fail_charge_denom_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + + return sysfs_emit(buf, "%u\n", quotas->fail_charge_denom); +} + +static ssize_t fail_charge_denom_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + int err = kstrtouint(buf, 0, "as->fail_charge_denom); + + if (err) + return -EINVAL; + return count; +} + static void damon_sysfs_quotas_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); @@ -1683,12 +1727,20 @@ static struct kobj_attribute damon_sysfs_quotas_effective_bytes_attr = static struct kobj_attribute damon_sysfs_quotas_goal_tuner_attr = __ATTR_RW_MODE(goal_tuner, 0600); +static struct kobj_attribute damon_sysfs_quotas_fail_charge_num_attr = + __ATTR_RW_MODE(fail_charge_num, 0600); + +static struct kobj_attribute damon_sysfs_quotas_fail_charge_denom_attr = + __ATTR_RW_MODE(fail_charge_denom, 0600); + static struct attribute *damon_sysfs_quotas_attrs[] = { &damon_sysfs_quotas_ms_attr.attr, &damon_sysfs_quotas_sz_attr.attr, &damon_sysfs_quotas_reset_interval_ms_attr.attr, &damon_sysfs_quotas_effective_bytes_attr.attr, &damon_sysfs_quotas_goal_tuner_attr.attr, + &damon_sysfs_quotas_fail_charge_num_attr.attr, + &damon_sysfs_quotas_fail_charge_denom_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_quotas); @@ -2776,6 +2828,8 @@ static struct damos *damon_sysfs_mk_scheme( .weight_nr_accesses = sysfs_weights->nr_accesses, .weight_age = sysfs_weights->age, .goal_tuner = sysfs_quotas->goal_tuner, + .fail_charge_num = sysfs_quotas->fail_charge_num, + .fail_charge_denom = sysfs_quotas->fail_charge_denom, }; struct damos_watermarks wmarks = { .metric = sysfs_wmarks->metric, -- 2.47.3