lkml.org 
[lkml]   [2010]   [Aug]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 04/10] Use percpu buffers
From
On Mon, Aug 9, 2010 at 8:26 PM, Nitin Gupta <ngupta@vflare.org> wrote:
> @@ -303,38 +307,41 @@ static int zram_write(struct zram *zram, struct bio *bio)
>                                zram_test_flag(zram, index, ZRAM_ZERO))
>                        zram_free_page(zram, index);
>
> -               mutex_lock(&zram->lock);
> +               preempt_disable();
> +               zbuffer = __get_cpu_var(compress_buffer);
> +               zworkmem = __get_cpu_var(compress_workmem);
> +               if (unlikely(!zbuffer || !zworkmem)) {
> +                       preempt_enable();
> +                       goto out;
> +               }

The per-CPU buffer thing with this preempt_disable() trickery looks
overkill to me. Most block device drivers seem to use mempool_alloc()
for this sort of thing. Is there some reason you can't use that here?
--
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: 2010-08-09 20:59    [W:0.421 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site