Re: [patch] speed up / fix the new generic semaphore code (fix AIM7 40% regression with 2.6.26-rc1)

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To: Linus Torvalds <torvalds@...>
Cc: Ingo Molnar <mingo@...>, Zhang, Yanmin <yanmin_zhang@...>, Andi Kleen <andi@...>, Matthew Wilcox <matthew@...>, LKML <linux-kernel@...>, Alexander Viro <viro@...>, Andrew Morton <akpm@...>, Thomas Gleixner <tglx@...>, H. Peter Anvin <hpa@...>
Date: Thursday, May 8, 2008 - 7:16 pm

> In fact, I thought we had fixed most of this already, but hey, I was 

I have pushed it down to n_tty line discipline code but not within that.
It is on the hit list but I'm working on more pressing stuff first (USB
layer, extracting commonality to start to tackle open etc etc)

I don't think fixing n_tty is now a big job if someone wants to take a
swing at it. The driver write/throttle/etc routines below the n_tty ldisc
layer are now BKL clean so it should just be the internal locking of the
buffers, window and the like to tackle.

Feel free to have a go 8)
--
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Messages in current thread:
AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Tue May 6, 1:48 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Tue May 6, 7:44 am)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Tue May 6, 10:11 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Tue May 6, 11:41 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Andi Kleen, (Wed May 7, 7:00 am)
Re: AIM7 40% regression with 2.6.26-rc1, Alan Cox, (Wed May 7, 9:59 am)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Wed May 7, 7:46 am)
Re: AIM7 40% regression with 2.6.26-rc1, Andi Kleen, (Wed May 7, 8:21 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 10:36 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 12:20 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 12:35 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 1:05 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 1:24 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 1:36 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 1:55 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Wed May 7, 1:59 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 2:17 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 2:49 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 11:19 am)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Wed May 7, 10:44 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Thu May 8, 2:43 am)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Thu May 8, 3:14 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Thu May 8, 3:39 am)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Thu May 8, 4:44 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Thu May 8, 5:21 am)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Thu May 8, 5:30 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Thu May 8, 5:29 am)
Re: AIM7 40% regression with 2.6.26-rc1, Andrew Morton, (Thu May 8, 2:48 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 11:29 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Thu May 8, 12:08 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Thu May 8, 12:17 am)
Re: [patch] speed up / fix the new generic semaphore code (f..., Alan Cox, (Thu May 8, 7:16 pm)
[git pull] scheduler fixes, Ingo Molnar, (Thu May 8, 11:10 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 7:03 am)
Re: [git pull] scheduler fixes, Sven Wegener, (Sun May 11, 10:10 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 9:01 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 9:06 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 9:45 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 7:48 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 8:50 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 8:52 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 9:02 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 9:54 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 10:22 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 10:32 am)
Re: [git pull] scheduler fixes, Linus Torvalds, (Sun May 11, 12:47 pm)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 10:46 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 9:26 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 10:00 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 10:18 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 10:42 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 10:48 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Sun May 11, 11:19 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 11:29 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Tue May 13, 10:11 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Tue May 13, 10:21 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Tue May 13, 10:42 am)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Tue May 13, 11:28 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Tue May 13, 1:13 pm)
Re: [git pull] scheduler fixes, Linus Torvalds, (Tue May 13, 1:22 pm)
Re: [git pull] scheduler fixes, Ingo Molnar, (Tue May 13, 5:05 pm)
Re: [git pull] scheduler fixes, Matthew Wilcox, (Sun May 11, 7:14 am)
Re: [git pull] scheduler fixes, Adrian Bunk, (Thu May 8, 11:33 am)
Re: [git pull] scheduler fixes, Ingo Molnar, (Thu May 8, 11:41 am)
Re: [git pull] scheduler fixes, Adrian Bunk, (Thu May 8, 3:42 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 1:14 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Andi Kleen, (Wed May 7, 10:57 am)
Re: AIM7 40% regression with 2.6.26-rc1, Andrew Morton, (Wed May 7, 11:31 am)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Wed May 7, 12:22 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Alan Cox, (Wed May 7, 10:35 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 11:00 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 11:02 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 2:26 am)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 2:28 am)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Wed May 7, 3:05 am)
Re: AIM7 40% regression with 2.6.26-rc1, Andrew Morton, (Tue May 6, 11:59 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Wed May 7, 12:46 am)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Tue May 6, 8:09 am)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Tue May 6, 12:23 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Wed May 7, 11:24 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 11:34 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Thu May 8, 12:37 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Thu May 8, 10:58 am)
Re: AIM7 40% regression with 2.6.26-rc1, Andrew Morton, (Tue May 6, 1:21 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Wed May 7, 12:38 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 12:55 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 1:08 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 1:22 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 1:31 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 1:49 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 2:02 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 2:17 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 2:27 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 2:43 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 3:01 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Wed May 7, 3:24 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 3:44 pm)
Oi. NFS people. Read this., Matthew Wilcox, (Wed May 7, 4:00 pm)
Re: Oi. NFS people. Read this., Trond Myklebust, (Wed May 7, 6:10 pm)
Re: Oi. NFS people. Read this., J. Bruce Fields, (Thu May 8, 9:43 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 3:09 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 1:47 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Wed May 7, 1:25 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Andrew Morton, (Wed May 7, 1:16 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Wed May 7, 1:27 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Tue May 6, 1:45 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Tue May 6, 1:39 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Zhang, Yanmin, (Wed May 7, 2:49 am)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Tue May 6, 1:31 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Ingo Molnar, (Tue May 6, 1:49 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Andrew Morton, (Tue May 6, 2:07 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Sun May 11, 7:11 am)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Tue May 6, 12:36 pm)
Re: AIM7 40% regression with 2.6.26-rc1, J. Bruce Fields, (Tue May 6, 12:44 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Tue May 6, 12:42 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Tue May 6, 4:28 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Alan Cox, (Tue May 6, 12:39 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Tue May 6, 12:51 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Linus Torvalds, (Tue May 6, 1:42 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Alan Cox, (Tue May 6, 12:45 pm)
Re: AIM7 40% regression with 2.6.26-rc1, Matthew Wilcox, (Tue May 6, 7:18 am)