Re: [PATCH] mm: vmscan.c: fix OOM on swap stress test

[Chris Li <chrisl@kernel.org>]

On Wed, Sep 4, 2024 at 11:54 PM Thorsten Leemhuis
<regressions@leemhuis.info> wrote:
>
>
>
> On 05.09.24 08:42, Yu Zhao wrote:
> > On Thu, Sep 5, 2024 at 12:21 AM Chris Li <chrisl@kernel.org> wrote:
> >>
> >> I found a regression on mm-unstable during my swap stress test,
> >> using tmpfs to compile linux. The test OOM very soon after
> >> the make spawns many cc processes.
> >>
> >> It bisects down to this change: 33dfe9204f29b415bbc0abb1a50642d1ba94f5e9
> >> (mm/gup: clear the LRU flag of a page before adding to LRU batch)
> >>
> >> Yu Zhao propose the fix: "I think this is one of the potential side
> >> effects -- Huge mentioned earlier about isolate_lru_folios():"
> >>
> >> I test that with it the swap stress test no longer OOM.
> >>
> >> Link: https://lore.kernel.org/r/CAOUHufYi9h0kz5uW3LHHS3ZrVwEq-kKp8S6N-MZUmErNAXoXmw@mail.gmail.com/
> >> Fixes: 33dfe9204f29 ("mm/gup: clear the LRU flag of a page before adding to LRU batch")
> >> Suggested-by: Yu Zhao <yuzhao@google.com>
> >> Suggested-by: Hugh Dickins <hughd@google.com>
> >> Tested-by: Chris Li <chrisl@kernel.org>
> >> Signed-off-by: Chris Li <chrisl@kernel.org>
>
> Thx for taking care of this, Chris!
>
> > Closes: https://lore.kernel.org/56651be8-1466-475f-b1c5-4087995cc5ae@leemhuis.info/
>
> FWIW, no big deal, but that ideally should be (in general and for
> regression tracking) the following instead, as that link above is just
> at the end of the thread with the report, but not the report itself --
> and that is what often needed when someone needs to look up the
> backstory of this chance sooner or later:
>
> Closes:
> https://lore.kernel.org/all/CAF8kJuNP5iTj2p07QgHSGOJsiUfYpJ2f4R1Q5-3BN9JiD9W_KA@mail.gmail.com/

Thanks you Yu and Thorsten,

I just submitted the V2 to include the Closes tag. Technically it
passes midnight here so it is another day I can submit another version
:-).

Chris