lkml.org 
[lkml]   [2001]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] avoid unnecessary cache flushes
On Fri, Aug 31, 2001 at 09:18:50PM +1000, Paul Mackerras wrote:
> + if (!test_bit(PG_arch_1, &page->flags)) {
> + __flush_dcache_icache((unsigned long)kmap(page));
> + kunmap(page);
> + set_bit(PG_arch_1, &page->flags);

Race. Use test_and_set_bit.

As for Alpha, all we have is "flush entire icache", so there's not
much interesting we can do by way of optimization I don't think.


r~
-
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: 2005-03-22 13:02    [W:0.127 / U:1.444 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site