lkml.org 
[lkml]   [2011]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 3/4] mm: bootmem: drop superfluous range check when freeing pages in bulk
On Tue, Dec 13, 2011 at 04:28:43PM +0100, Uwe Kleine-König wrote:
> Hello Johannes,
>
> On Tue, Dec 13, 2011 at 02:58:30PM +0100, Johannes Weiner wrote:
> > The area node_bootmem_map represents is aligned to BITS_PER_LONG, and
> > all bits in any aligned word of that map valid. When the represented
> > area extends beyond the end of the node, the non-existant pages will
> > be marked as reserved.
> >
> > As a result, when freeing a page block, doing an explicit range check
> > for whether that block is within the node's range is redundant as the
> > bitmap is consulted anyway to see whether all pages in the block are
> > unreserved.
> >
> > Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> I suggest to drop my patch then and add something like
>
> Reported-by: $me
>
> to this one instead.

Your patch is a real and obvious fix, while mine is just a cleanup but
has more obscure dependencies on how the bitmap is managed.

If you don't mind, I would prefer to keep them as separate changes.

> Other than that I will give your series a spin on my ARM machine later
> today.

Thanks a lot!
--
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: 2011-12-13 16:47    [W:0.433 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site