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Date: Mon, 07 Oct 2013 22:51:18 -0400
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
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Subject: Re: [PATCH 05/14] vrange: Add new vrange(2) system call
References: <1380761503-14509-6-git-send-email-john.stultz@linaro.org> <52533C12.9090007@zytor.com> <5253404D.2030503@linaro.org> <52534331.2060402@zytor.com> <52534692.7010400@linaro.org> <525347BE.7040606@zytor.com> <525349AE.1070904@linaro.org> <52534AEC.5040403@zytor.com> <20131008001306.GD25780@bbox> <52535EE1.3060700@zytor.com> <20131008020847.GH25780@bbox>
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To: Minchan Kim <minchan@kernel.org>
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>, KOSAKI Motohiro <kosaki.motohiro@gmail.com>, Michel Lespinasse <walken@google.com>, Rob Clark <robdclark@gmail.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>

> 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?


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