From: Anton Blanchard <anton@samba.org>
To: William Lee Irwin III <wli@holomorphy.com>,
linux-kernel@vger.kernel.org, rddunlap@osdl.org, akpm@osdl.org
Subject: Re: [profile]: [0/23] mmap() support for /proc/profile
Date: Wed, 23 Jun 2004 13:00:12 +1000 [thread overview]
Message-ID: <20040623030012.GA22495@krispykreme> (raw)
In-Reply-To: <20040623020506.GA1832@holomorphy.com>
Hi,
> Well, this is a little different. I was more concerned about the
> "Heisenberg effect" that the in-kernel copies to fetch profiling data
> had upon the data fetched. i.e. instead of idle time and the stuff I
> was looking for, I saw copy_to_user() and all kinds of vfs and /proc/
> crap instead, which blew what I was looking for completely out of the
> top 20. The profiling I did was on UP, which was done in part to
> eliminate lock contention as the cause of the phenomena I had observed.
Sure, I was just pointing out another area in our profiling code that
warrants attention :)
Anton
prev parent reply other threads:[~2004-06-23 3:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-22 15:16 William Lee Irwin III
2004-06-22 15:16 ` [profile]: [1/23] move proc_profile_operations to profile.c William Lee Irwin III
2004-06-22 15:16 ` [profile]: [2/23] ppc32 profiling cleanups William Lee Irwin III
2004-06-22 15:16 ` [profile]: [3/23] mips " William Lee Irwin III
2004-06-22 15:16 ` [profile]: [4/23] sparc64 " William Lee Irwin III
2004-06-22 15:16 ` [profile]: [5/23] m68knommu " William Lee Irwin III
2004-06-22 15:16 ` [profile]: [6/23] sparc32 " William Lee Irwin III
2004-06-22 15:16 ` [profile]: [7/23] superh " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [8/23] arm26 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [9/23] m68k " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [10/23] ia64 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [11/23] alpha " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [12/23] ppc64 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [13/23] arm " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [14/23] parisc " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [15/23] h8300 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [16/23] s390 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [17/23] x86-64 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [18/23] i386 " William Lee Irwin III
2004-06-22 15:17 ` [profile]: [19/23] remove public decls of profile.c internal state William Lee Irwin III
2004-06-22 15:17 ` [profile]: [20/23] clean up profile_init() not to oversize buffer William Lee Irwin III
2004-06-22 15:17 ` [profile]: [21/23] use atomic_t for prof_buffer William Lee Irwin III
2004-06-22 15:18 ` [profile]: [22/23] put 1 << prof_shift at prof_buffer[0] William Lee Irwin III
2004-06-22 15:18 ` [profile]: [23/23] add mmap() support for /proc/profile William Lee Irwin III
2004-06-22 17:03 ` William Lee Irwin III
2004-06-22 17:10 ` [profile]: [22/23] put 1 << prof_shift at prof_buffer[0] William Lee Irwin III
2004-06-22 17:12 ` William Lee Irwin III
2004-06-22 20:01 ` [profile]: [21/23] use atomic_t for prof_buffer David S. Miller
2004-06-22 20:16 ` William Lee Irwin III
2004-06-22 20:47 ` David S. Miller
2004-06-29 18:56 ` [profile]: [10/23] ia64 profiling cleanups David Mosberger
2004-06-29 19:23 ` William Lee Irwin III
2004-06-22 23:16 ` [profile]: [0/23] mmap() support for /proc/profile Anton Blanchard
2004-06-23 1:58 ` David S. Miller
2004-06-23 2:05 ` William Lee Irwin III
2004-06-23 3:00 ` Anton Blanchard [this message]
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