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Re: [address@hidden: [PATCH] Make __getclktck return 100 for the Hurd]
From: |
Richard Braun |
Subject: |
Re: [address@hidden: [PATCH] Make __getclktck return 100 for the Hurd] |
Date: |
Wed, 12 Jun 2013 01:05:05 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Tue, Jun 11, 2013 at 03:55:46PM -0700, Roland McGrath wrote:
> > The /proc file system is merely an example. Also, it's not internal to
> > libc, since it gets exported through sysconf(_SC_CLK_TCK).
>
> You'll have to explain what problem you think there is more thoroughly.
Basically, top doesn't report correct CPU times. This is caused by
sysconf() returning 1000000 while values read from /proc are true tick
counts, hence 100 per second at most. This discrepancy can be solved
either by making /proc scale its values, or making libc return the
actual number of ticks per second. I personally think the latter is
better for clarity, and also to limit overflows for long running
processes, although that's really secondary.
--
Richard Braun