From: Tejun Heo <[email protected]>
To: Ammar Faizi <[email protected]>
Cc: Chris Mason <[email protected]>, Josef Bacik <[email protected]>,
David Sterba <[email protected]>,
Lai Jiangshan <[email protected]>,
Filipe Manana <[email protected]>,
Linux Btrfs Mailing List <[email protected]>,
Linux Kernel Mailing List <[email protected]>,
Linux Fsdevel Mailing List <[email protected]>,
GNU/Weeb Mailing List <[email protected]>
Subject: Re: [RFC PATCH v1 0/6] Introducing `wq_cpu_set` mount option for btrfs
Date: Sun, 26 Feb 2023 07:01:41 -1000 [thread overview]
Message-ID: <Y/[email protected]> (raw)
In-Reply-To: <[email protected]>
On Sun, Feb 26, 2023 at 11:02:53PM +0700, Ammar Faizi wrote:
> Hi,
>
> This is an RFC patchset that introduces the `wq_cpu_set` mount option.
> This option lets the user specify a CPU set that the Btrfs workqueues
> will use.
>
> Btrfs workqueues can slow sensitive user tasks down because they can use
> any online CPU to perform heavy workloads on an SMP system. Add a mount
> option to isolate the Btrfs workqueues to a set of CPUs. It is helpful
> to avoid sensitive user tasks being preempted by Btrfs heavy workqueues.
>
> This option is similar to the taskset bitmask except that the comma
> separator is replaced with a dot. The reason for this is that the mount
> option parser uses commas to separate mount options.
Hmm... the allowed cpumasks for unbounded workqueues can already be set
through /sys/devices/virtual/workqueue/cpumask and also each individual
workqueue can be exposed in the matching subdirectory by setting WQ_SYSFS.
Wouldn't the proposed btrfs option be a bit reduandant?
Thanks.
--
tejun
next prev parent reply other threads:[~2023-02-26 17:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-26 16:02 [RFC PATCH v1 0/6] Introducing `wq_cpu_set` mount option for btrfs Ammar Faizi
2023-02-26 16:02 ` [RFC PATCH v1 1/6] workqueue: Add set_workqueue_cpumask() helper function Ammar Faizi
2023-02-26 16:02 ` [RFC PATCH v1 2/6] btrfs: Change `mount_opt` type in `struct btrfs_fs_info` to `u64` Ammar Faizi
2023-02-26 16:02 ` [RFC PATCH v1 3/6] btrfs: Create btrfs CPU set struct and helpers Ammar Faizi
2023-02-26 16:02 ` [RFC PATCH v1 4/6] btrfs: Add wq_cpu_set=%s mount option Ammar Faizi
2023-02-26 16:02 ` [RFC PATCH v1 5/6] btrfs: Adjust the default thread pool size when `wq_cpu_set` option is used Ammar Faizi
2023-02-26 16:02 ` [RFC PATCH v1 6/6] btrfs: Add `BTRFS_DEFAULT_MAX_THREAD_POOL_SIZE` macro Ammar Faizi
2023-02-26 17:01 ` Tejun Heo [this message]
2023-02-26 18:26 ` [RFC PATCH v1 0/6] Introducing `wq_cpu_set` mount option for btrfs Ammar Faizi
2023-02-26 18:29 ` Ammar Faizi
2023-02-27 10:18 ` Qu Wenruo
2023-02-27 13:42 ` Ammar Faizi
2023-02-27 23:49 ` Qu Wenruo
2023-02-27 11:02 ` Filipe Manana
[not found] ` <[email protected]>
2023-02-27 13:45 ` Ammar Faizi
2023-02-27 16:24 ` Roman Mamedov
2023-02-27 22:17 ` Dave Chinner
2023-02-28 8:01 ` Ammar Faizi
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