Re: [PATCH-RFC] cfq: Disable low_latency by default for 2.6.32

[KOSAKI Motohiro]

> Instead, PF_MEMALLOC is good idea?

This patch was obviously wrong. please forget it. i'm sorry.

> 
> 
> Subject: [PATCH] cfq: Do not limit the async queue depth while memory reclaim
> 
> Not-Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> (I haven't test this)
> ---
>  block/cfq-iosched.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index aa1e953..9546f64 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -1308,7 +1308,8 @@ static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq)
>  	 * We also ramp up the dispatch depth gradually for async IO,
>  	 * based on the last sync IO we serviced
>  	 */
> -	if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) {
> +	if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency &&
> +	    !(current->flags & PF_MEMALLOC)) {
>  		unsigned long last_sync = jiffies - cfqd->last_end_sync_rq;
>  		unsigned int depth;
>  
> -- 
> 1.6.5.2
> 
> 
> 
> 
> 
> 



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