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Date: Tue, 8 Oct 2013 12:07:36 +0900
From: Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCH 05/14] vrange: Add new vrange(2) system call
Message-ID: <20131008030736.GA29509@bbox>
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To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, John Stultz <john.stultz@linaro.org>, LKML <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Android Kernel Team <kernel-team@android.com>, Robert Love <rlove@google.com>, Mel Gorman <mel@csn.ul.ie>, Hugh Dickins <hughd@google.com>, Dave Hansen <dave.hansen@intel.com>, Rik van Riel <riel@redhat.com>, Dmitry Adamushko <dmitry.adamushko@gmail.com>, Dave Chinner <david@fromorbit.com>, Neil Brown <neilb@suse.de>, Andrea Righi <andrea@betterlinux.com>, Andrea Arcangeli <aarcange@redhat.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Mike Hommey <mh@glandium.org>, Taras Glek <tglek@mozilla.com>, Dhaval Giani <dhaval.giani@gmail.com>, Jan Kara <jack@suse.cz>, Michel Lespinasse <walken@google.com>, Rob Clark <robdclark@gmail.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>

Hi KOSAKI,

On Mon, Oct 07, 2013 at 10:51:18PM -0400, KOSAKI Motohiro wrote:
> >Maybe, int madvise5(addr, length, MADV_DONTNEED|MADV_LAZY|MADV_SIGBUS,
> >         &purged, &ret);
> >
> >Another reason to make it hard is that madvise(2) is tight coupled with
> >with vmas split/merge. It needs mmap_sem's write-side lock and it hurt
> >anon-vrange test performance much heavily and userland might want to
> >make volatile range with small unit like "page size" so it's undesireable
> >to make it with vma. Then, we should filter out to avoid vma split/merge
> >in implementation if only MADV_LAZY case? Doable but it could make code
> >complicated and lost consistency with other variant of madvise.
> 
> I haven't seen your performance test result. Could please point out URLs?

https://lkml.org/lkml/2013/3/12/105

-- 
Kind regards,
Minchan Kim

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