Re: [PATCH v2] fs-writeback: writeback_sb_inodes：Recalculate 'wrote' according skipped pages

[Linus Torvalds]

On Mon, Apr 18, 2022 at 3:20 PM Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> Here's the thread:
>
> https://lore.kernel.org/all/1295659049-2688-6-git-send-email-jaxboe@xxxxxxxxxxxx/
>
> I'll dig through it in a bit, but here's your reasoning for why it
> should not flush on preemption:
>
> https://lore.kernel.org/all/BANLkTikBEJa7bJJoLFU7NoiEgOjVHVG08A@xxxxxxxxxxxxxx/

Well, that one was triggered by that whole "now it can happen
anywhere" worry that people had.

So yes, IO patterns are a worry, but I think the bigger worry - even
back then - was that preemption points can be pretty much anywhere in
the code.

              Linus