[lkml]   [2005]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [patch] use cheaper elv_queue_empty when unplug a device
On Tue, Mar 29 2005, Arjan van de Ven wrote:
> On Tue, 2005-03-29 at 19:19 +1000, Nick Piggin wrote:
> > - removes the relock/retry merge mechanism in __make_request if we
> > aren't able to get the GFP_ATOMIC allocation. Just fall through
> > and assume the chances of getting a merge will be small (is this
> > a valid assumption? Should measure it I guess).
> this may have a potential problem; if the vm gets in trouble, you
> suddenly start to generate worse IO patterns, which means IO performance
> goes down right when it's most needed.....
> of course we need to figure if this actually ever hits in practice,
> because if it doesn't I'm all for simpler code.

Precisely, see my response as well. If the noretry flag works, that
should be fine.

Jens Axboe

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-04-06 13:31    [W:0.112 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site