lkml.org 
[lkml]   [2006]   [Oct]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Allow a larger buffer for writes to cpuset files
Paul M wrote:
> @@ -1292,7 +1292,7 @@ static ssize_t cpuset_common_file_write(
> int retval = 0;
>
> /* Crude upper limit on largest legitimate cpulist user might write. */
> - if (nbytes > 100 + 6 * NR_CPUS)
> + if (nbytes >= PAGE_SIZE)

On a system with 4 Kbyte pages, this imposes a tighter limit
if NR_CPUS is > 666.

On a system with 16 Kbyte pages, this imposes a tighter limit
if NR_CPUS is > 2714.

Those CPU counts don't look that futuristic to me.

And it makes the limit more aribitrary ... like what the heck does
that check have to do with PAGE_SIZE ?

How about coding for the possibility that either NR_CPUS or MAX_NUMNODES
is larger, and removing 'cpu' from the comment:

/* Crude upper limit on largest legitimate list user might write. */
if (nbytes > 100 + 6 * max(NR_CPUS, MAX_NUMNODES))

--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-31 05:03    [W:0.077 / U:0.420 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site