Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys_msync()

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To: Linus Torvalds <torvalds@...>
Cc: Miklos Szeredi <miklos@...>, <a.p.zijlstra@...>, <salikhmetov@...>, <linux-mm@...>, <jakob@...>, <linux-kernel@...>, <valdis.kletnieks@...>, <riel@...>, <ksm@...>, <staubach@...>, <jesper.juhl@...>, <akpm@...>, <protasnb@...>, <r.e.wolff@...>, <hidave.darkstar@...>, <hch@...>
Date: Wednesday, January 23, 2008 - 8:03 pm

On Wed, 23 Jan 2008, Linus Torvalds wrote:

What we might reasonably choose to end up doing there (in 2.6.25)
is sending tmpfs etc. through the extra faulting for linked files,
but skipping it as at present for unlinked files i.e. shared memory
would continue to skip the extra faults, shared memory being the case we
really wanted to avoid the overhead on when dirty page accounting came in.


I care a bit, because I don't like to feel that tmpfs is now left
saddled with the bug that every filesystem has had for years before.
I'll need to compare the small performance cost of fixing it against
the unease of leaving it alone.

Hugh
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Messages in current thread:
[PATCH -v8 0/4] Fixing the issue with memory-mapped file times, Anton Salikhmetov, (Tue Jan 22, 7:21 pm)
[PATCH -v8 4/4] The design document for memory-mapped file t..., Anton Salikhmetov, (Tue Jan 22, 7:21 pm)
Re: [PATCH -v8 4/4] The design document for memory-mapped fi..., Anton Salikhmetov, (Fri Jan 25, 12:40 pm)
Re: [PATCH -v8 4/4] The design document for memory-mapped fi..., Anton Salikhmetov, (Wed Jan 23, 6:37 am)
Re: [PATCH -v8 4/4] The design document for memory-mapped fi..., Anton Salikhmetov, (Wed Jan 23, 8:25 am)
[PATCH -v8 1/4] Massive code cleanup of sys_msync(), Anton Salikhmetov, (Tue Jan 22, 7:21 pm)
[PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys_msy..., Anton Salikhmetov, (Tue Jan 22, 7:21 pm)
Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys..., Hugh Dickins, (Wed Jan 23, 8:03 pm)
Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys..., Anton Salikhmetov, (Wed Jan 23, 1:26 pm)
Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys..., Anton Salikhmetov, (Wed Jan 23, 8:53 am)
Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys..., Anton Salikhmetov, (Wed Jan 23, 9:09 am)
[PATCH -v8 2/4] Update ctime and mtime for memory-mapped files, Anton Salikhmetov, (Tue Jan 22, 7:21 pm)
Re: [PATCH -v8 2/4] Update ctime and mtime for memory-mapped..., Anton Salikhmetov, (Wed Jan 23, 7:14 pm)