linux-kernel - Re: [PATCH v5 00/16] mm: Page fault enhancements

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Date:   Mon, 14 Oct 2019 16:40:52 +0800
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        Jerome Glisse <jglisse@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Martin Cracauer <cracauer@...s.org>,
        Matthew Wilcox <willy@...radead.org>, Shaohua Li <shli@...com>,
        Marty McFadden <mcfadden8@...l.gov>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>
Subject: Re: [PATCH v5 00/16] mm: Page fault enhancements

On Thu, Sep 26, 2019 at 05:38:48PM +0800, Peter Xu wrote:
> This is v5 of the series.  As Matthew suggested, I split the previous
> patch "mm: Return faster for non-fatal signals in user mode faults"
> into a few smaller ones:
> 
>   1. One patch to introduce fatal_signal_pending(), and use it in
>      archs that can directly apply
> 
>   2. A few more patches to let the rest archs to use the new helper.
>      With that we can have an unified entry for signal detection
> 
>   3. One last patch to change fatal_signal_pending() to detect
>      userspace non-fatal signal
> 
> Nothing should have changed in the rest patches.  Because the fault
> retry patches will depend on the previous ones, I decided to simply
> repost all the patches.
> 
> Here's the new patchset layout:
> 
> Patch 1-2:      cleanup, and potential bugfix of hugetlbfs on fault retry
> 
> Patch 3-9:      let page fault to respond to non-fatal signals faster
> 
> Patch 10:       remove the userfaultfd NOPAGE emulation
> 
> Patch 11-14:    allow page fault to retry more than once
> 
> Patch 15-16:    let gup code to use FAULT_FLAG_KILLABLE too
> 
> I would really appreciate any review comments for the series,
> especially for the first two patches which IMHO are even not related
> to this patchset and they should either cleanup or fix things.

Ping..

IMHO this series should fix some real issues, e.g., the whole series
targets to fix things like [1] or as patch 2 might fix potential
bugs.  I'd appreciate if it can get some more review comments.

I didn't repost because the last patch only need a one-line change so
I assume it does not affect the most rest of reviews.  I can repost if
anyone would like me to.

Thanks,

[1] https://lore.kernel.org/lkml/20171102193644.GB22686@redhat.com/

-- 
Peter Xu