Re: [f2fs-dev] [PATCH v3] f2fs: fix to freeze GC and discard threads quickly

[Chao Yu <chao@kernel.org>]

On 2026/3/17 02:59, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@google.com>
> 
> Suspend can fail if kernel threads do not freeze for a while.
> f2fs_gc and f2fs_discard threads can perform long-running operations
> that prevent them from reaching a freeze point in a timely manner.
> 
> This patch adds explicit freezing checks in the following locations:
> 1. f2fs_gc: Added a check at the 'retry' label to exit the loop quickly
>     if freezing is requested, especially during heavy GC rounds.
> 2. __issue_discard_cmd: Added a 'suspended' flag to break both inner and
>     outer loops during discard command issuance if freezing is detected
>     after at least one command has been issued.
> 3. __issue_discard_cmd_orderly: Added a similar check for orderly discard
>     to ensure responsiveness.
> 
> These checks ensure that the threads release locks safely and enter the
> frozen state.
> 
> Signed-off-by: Daeho Jeong <daehojeong@google.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,