linux-kernel - Re: [RFC PATCH 2/3] mm: Drop use of test_and_set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAKgT0Uf0TbRBVsuGZ1bgh5rdFp+vARkP=+GgD4-DP3Gy6cj+pA@mail.gmail.com>
Date:   Fri, 14 Aug 2020 07:24:40 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     Yang Shi <yang.shi@...ux.alibaba.com>,
        kbuild test robot <lkp@...el.com>,
        Rong Chen <rong.a.chen@...el.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Hugh Dickins <hughd@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        linux-mm <linux-mm@...ck.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>, cgroups@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [RFC PATCH 2/3] mm: Drop use of test_and_set_skip in favor of
 just setting skip

On Fri, Aug 14, 2020 at 12:19 AM Alex Shi <alex.shi@...ux.alibaba.com> wrote:
>
>
>
> 在 2020/8/13 下午12:02, Alexander Duyck 写道:
> >
> > Since we have dropped the late abort case we can drop the code that was
> > clearing the LRU flag and calling page_put since the abort case will now
> > not be holding a reference to a page.
> >
> > Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
>
> seems the case-lru-file-mmap-read case drop about 3% on this patch in a rough testing.
> on my 80 core machine.

I'm not sure how it could have that much impact on the performance
since the total effect would just be dropping what should be a
redundant test since we tested the skip bit before we took the LRU
bit, so we shouldn't need to test it again after.

I finally got my test setup working last night. I'll have to do some
testing in my environment and I can start trying to see what is going
on.

Thanks.

- Alex