linux-kernel - Re: [PATCH v4] mm: Avoid unnecessary page fault retires on shared memory types

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Message-ID: <87mtezll8j.fsf@mpe.ellerman.id.au>
Date:   Mon, 30 May 2022 14:04:12 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4] mm: Avoid unnecessary page fault retires on shared
 memory types

Peter Xu <peterx@...hat.com> writes:
> I observed that for each of the shared file-backed page faults, we're very
> likely to retry one more time for the 1st write fault upon no page.  It's
> because we'll need to release the mmap lock for dirty rate limit purpose
> with balance_dirty_pages_ratelimited() (in fault_dirty_shared_page()).
>
...

>  arch/powerpc/mm/copro_fault.c |  5 +++++
>  arch/powerpc/mm/fault.c       |  5 +++++

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers