From: Yu Kuai <yukuai1@huaweicloud.com> To: tj@kernel.org, josef@toxicpanda.com, axboe@kernel.dk Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH v4 3/5] blk-iocost: read params inside lock in sysfs apis Date: Tue, 17 Jan 2023 15:08:04 +0800 [thread overview] Message-ID: <20230117070806.3857142-4-yukuai1@huaweicloud.com> (raw) In-Reply-To: <20230117070806.3857142-1-yukuai1@huaweicloud.com> From: Yu Kuai <yukuai3@huawei.com> Otherwise, user might get abnormal values if params is updated concurrently. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Acked-by: Tejun Heo <tj@kernel.org> --- block/blk-iocost.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/blk-iocost.c b/block/blk-iocost.c index d6256731cae4..d6f692d2283c 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -3129,6 +3129,7 @@ static u64 ioc_qos_prfill(struct seq_file *sf, struct blkg_policy_data *pd, if (!dname) return 0; + spin_lock_irq(&ioc->lock); seq_printf(sf, "%s enable=%d ctrl=%s rpct=%u.%02u rlat=%u wpct=%u.%02u wlat=%u min=%u.%02u max=%u.%02u\n", dname, ioc->enabled, ioc->user_qos_params ? "user" : "auto", ioc->params.qos[QOS_RPPM] / 10000, @@ -3141,6 +3142,7 @@ static u64 ioc_qos_prfill(struct seq_file *sf, struct blkg_policy_data *pd, ioc->params.qos[QOS_MIN] % 10000 / 100, ioc->params.qos[QOS_MAX] / 10000, ioc->params.qos[QOS_MAX] % 10000 / 100); + spin_unlock_irq(&ioc->lock); return 0; } @@ -3320,12 +3322,14 @@ static u64 ioc_cost_model_prfill(struct seq_file *sf, if (!dname) return 0; + spin_lock_irq(&ioc->lock); seq_printf(sf, "%s ctrl=%s model=linear " "rbps=%llu rseqiops=%llu rrandiops=%llu " "wbps=%llu wseqiops=%llu wrandiops=%llu\n", dname, ioc->user_cost_model ? "user" : "auto", u[I_LCOEF_RBPS], u[I_LCOEF_RSEQIOPS], u[I_LCOEF_RRANDIOPS], u[I_LCOEF_WBPS], u[I_LCOEF_WSEQIOPS], u[I_LCOEF_WRANDIOPS]); + spin_unlock_irq(&ioc->lock); return 0; } -- 2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Yu Kuai <yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org> To: tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, josef-DigfWCa+lFGyeJad7bwFQA@public.gmane.org, axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org, yi.zhang-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, yangerkun-hv44wF8Li93QT0dZR+AlfA@public.gmane.org Subject: [PATCH v4 3/5] blk-iocost: read params inside lock in sysfs apis Date: Tue, 17 Jan 2023 15:08:04 +0800 [thread overview] Message-ID: <20230117070806.3857142-4-yukuai1@huaweicloud.com> (raw) In-Reply-To: <20230117070806.3857142-1-yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org> From: Yu Kuai <yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> Otherwise, user might get abnormal values if params is updated concurrently. Signed-off-by: Yu Kuai <yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> Acked-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> --- block/blk-iocost.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/blk-iocost.c b/block/blk-iocost.c index d6256731cae4..d6f692d2283c 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -3129,6 +3129,7 @@ static u64 ioc_qos_prfill(struct seq_file *sf, struct blkg_policy_data *pd, if (!dname) return 0; + spin_lock_irq(&ioc->lock); seq_printf(sf, "%s enable=%d ctrl=%s rpct=%u.%02u rlat=%u wpct=%u.%02u wlat=%u min=%u.%02u max=%u.%02u\n", dname, ioc->enabled, ioc->user_qos_params ? "user" : "auto", ioc->params.qos[QOS_RPPM] / 10000, @@ -3141,6 +3142,7 @@ static u64 ioc_qos_prfill(struct seq_file *sf, struct blkg_policy_data *pd, ioc->params.qos[QOS_MIN] % 10000 / 100, ioc->params.qos[QOS_MAX] / 10000, ioc->params.qos[QOS_MAX] % 10000 / 100); + spin_unlock_irq(&ioc->lock); return 0; } @@ -3320,12 +3322,14 @@ static u64 ioc_cost_model_prfill(struct seq_file *sf, if (!dname) return 0; + spin_lock_irq(&ioc->lock); seq_printf(sf, "%s ctrl=%s model=linear " "rbps=%llu rseqiops=%llu rrandiops=%llu " "wbps=%llu wseqiops=%llu wrandiops=%llu\n", dname, ioc->user_cost_model ? "user" : "auto", u[I_LCOEF_RBPS], u[I_LCOEF_RSEQIOPS], u[I_LCOEF_RRANDIOPS], u[I_LCOEF_WBPS], u[I_LCOEF_WSEQIOPS], u[I_LCOEF_WRANDIOPS]); + spin_unlock_irq(&ioc->lock); return 0; } -- 2.31.1
next prev parent reply other threads:[~2023-01-17 6:44 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-01-17 7:08 [PATCH v4 0/5] blk-iocost: random bugfix Yu Kuai 2023-01-17 7:08 ` [PATCH v4 1/5] blk-iocost: check return value of match_u64() Yu Kuai 2023-01-17 7:08 ` [PATCH v4 2/5] blk-iocost: don't allow to configure bio based device Yu Kuai 2023-01-17 7:08 ` Yu Kuai [this message] 2023-01-17 7:08 ` [PATCH v4 3/5] blk-iocost: read params inside lock in sysfs apis Yu Kuai 2023-01-17 7:08 ` [PATCH v4 4/5] blk-iocost: fix divide by 0 error in calc_lcoefs() Yu Kuai 2023-01-18 17:18 ` Tejun Heo 2023-01-17 7:08 ` [PATCH v4 5/5] blk-iocost: change div64_u64 to DIV64_U64_ROUND_UP in ioc_refresh_params() Yu Kuai 2023-01-17 7:08 ` Yu Kuai 2023-01-20 15:40 ` [PATCH v4 0/5] blk-iocost: random bugfix Jens Axboe
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20230117070806.3857142-4-yukuai1@huaweicloud.com \ --to=yukuai1@huaweicloud.com \ --cc=axboe@kernel.dk \ --cc=cgroups@vger.kernel.org \ --cc=josef@toxicpanda.com \ --cc=linux-block@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=tj@kernel.org \ --cc=yangerkun@huawei.com \ --cc=yi.zhang@huawei.com \ --cc=yukuai3@huawei.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.