Re: [PATCH] vfs: avoid taking locks if inode not in lists

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To: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Subject: Re: [PATCH] vfs: avoid taking locks if inode not in lists
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Wed, 27 Jul 2011 19:12:12 +0200
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Matthew Wilcox <matthew@xxxxxx>, Anton Blanchard <anton@xxxxxxxxx>, npiggin@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, netdev <netdev@xxxxxxxxxxxxxxx>
In-reply-to: <1311780065.2356.18.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
User-agent: Mutt/1.4.2.2i

> Before even taking locks, we can perform an unlocked test to check if
> inode can possibly be in the lists.
> 
> On a 2x4x2 machine, a close(socket()) pair can be 200% faster with these
> changes.

Great result! Seems simple and obvious to me.

-Andi

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References:
- Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)
  - From: Tim Chen
- Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)
  - From: Christoph Hellwig
- Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)
  - From: Tim Chen
- Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)
  - From: Al Viro
- Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)
  - From: Tim Chen
- Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)
  - From: Eric Dumazet
- [PATCH] vfs: dont chain pipe/anon/socket on superblock s_inodes list
  - From: Eric Dumazet
- Re: [PATCH] vfs: dont chain pipe/anon/socket on superblock s_inodes list
  - From: Christoph Hellwig
- Re: [PATCH] vfs: dont chain pipe/anon/socket on superblock s_inodes list
  - From: Eric Dumazet
- [PATCH] vfs: avoid taking locks if inode not in lists
  - From: Eric Dumazet

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