[lkml]   [2008]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] x86: add the debugfs interface for the sysprof tool
On Sat, Feb 23, 2008 at 10:11 AM, Andrew Morton
<> wrote:
> Seems a poor idea to me. Sure, oprofile is "hard to set up", but not if
> your distributor already did it for you.
> Sidebar: the code uses the utterly crappy register_timer_hook() which
> a) is woefully misnamed and
> b) is racy and
> c) will disrupt oprofile if it is being used. And vice versa.

I wonder if sysprof should hook to the same interrupt as oprofile then?

On Sat, Feb 23, 2008 at 10:11 AM, Andrew Morton
<> wrote:
> This code adds a new kernel->userspace interface which is not even
> documented in code comments. It appears to use a pollable debugfs file in
> /proc somewhere, carrying an unspecified payload.


> This reads a single item even if there were 100 queued, which is quite
> inefficient.
> We already have infrastructure for bulk kernel->user transfer in
> kernel/relay.c?

Agreed. This seems like a perfect fit with relayfs.

 \ /
  Last update: 2008-02-23 15:57    [W:0.193 / U:25.832 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site