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From: Michal Hocko <mhocko@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>,
	Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>,
	Olaf Hering <olaf@aepfle.de>,
	linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-mm@kvack.org, Mel Gorman <mgorman@techsingularity.net>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	David Rientjes <rientjes@google.com>,
	Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 3/4] mm, compaction: restrict full priority to non-costly orders
Date: Wed, 21 Sep 2016 19:15:01 +0200	[thread overview]
Message-ID: <20160921171501.GG24210@dhcp22.suse.cz> (raw)
In-Reply-To: <20160906135258.18335-4-vbabka@suse.cz>

On Tue 06-09-16 15:52:57, Vlastimil Babka wrote:
> The new ultimate compaction priority disables some heuristics, which may result
> in excessive cost. This is fine for non-costly orders where we want to try hard
> before resulting for OOM, but might be disruptive for costly orders which do
> not trigger OOM and should generally have some fallback. Thus, we disable the
> full priority for costly orders.
> 
> Suggested-by: Michal Hocko <mhocko@kernel.org>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Mel Gorman <mgorman@techsingularity.net>
> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Rik van Riel <riel@redhat.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
>  include/linux/compaction.h | 1 +
>  mm/page_alloc.c            | 5 ++++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/compaction.h b/include/linux/compaction.h
> index 585d55cb0dc0..0d8415820fc3 100644
> --- a/include/linux/compaction.h
> +++ b/include/linux/compaction.h
> @@ -9,6 +9,7 @@ enum compact_priority {
>  	COMPACT_PRIO_SYNC_FULL,
>  	MIN_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_FULL,
>  	COMPACT_PRIO_SYNC_LIGHT,
> +	MIN_COMPACT_COSTLY_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
>  	DEF_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
>  	COMPACT_PRIO_ASYNC,
>  	INIT_COMPACT_PRIORITY = COMPACT_PRIO_ASYNC
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f8bed910e3cf..ff60a2837c58 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3165,6 +3165,7 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
>  		     int compaction_retries)
>  {
>  	int max_retries = MAX_COMPACT_RETRIES;
> +	int min_priority;
>  
>  	if (!order)
>  		return false;
> @@ -3204,7 +3205,9 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
>  	 * if we exhausted all retries at the lower priorities
>  	 */
>  check_priority:
> -	if (*compact_priority > MIN_COMPACT_PRIORITY) {
> +	min_priority = (order > PAGE_ALLOC_COSTLY_ORDER) ?
> +			MIN_COMPACT_COSTLY_PRIORITY : MIN_COMPACT_PRIORITY;
> +	if (*compact_priority > min_priority) {
>  		(*compact_priority)--;
>  		return true;
>  	}
> -- 
> 2.9.3

-- 
Michal Hocko
SUSE Labs

WARNING: multiple messages have this Message-ID
From: Michal Hocko <mhocko@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>,
	Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>,
	Olaf Hering <olaf@aepfle.de>,
	linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-mm@kvack.org, Mel Gorman <mgorman@techsingularity.net>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	David Rientjes <rientjes@google.com>,
	Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 3/4] mm, compaction: restrict full priority to non-costly orders
Date: Wed, 21 Sep 2016 19:15:01 +0200	[thread overview]
Message-ID: <20160921171501.GG24210@dhcp22.suse.cz> (raw)
In-Reply-To: <20160906135258.18335-4-vbabka@suse.cz>

On Tue 06-09-16 15:52:57, Vlastimil Babka wrote:
> The new ultimate compaction priority disables some heuristics, which may result
> in excessive cost. This is fine for non-costly orders where we want to try hard
> before resulting for OOM, but might be disruptive for costly orders which do
> not trigger OOM and should generally have some fallback. Thus, we disable the
> full priority for costly orders.
> 
> Suggested-by: Michal Hocko <mhocko@kernel.org>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Mel Gorman <mgorman@techsingularity.net>
> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Rik van Riel <riel@redhat.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
>  include/linux/compaction.h | 1 +
>  mm/page_alloc.c            | 5 ++++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/compaction.h b/include/linux/compaction.h
> index 585d55cb0dc0..0d8415820fc3 100644
> --- a/include/linux/compaction.h
> +++ b/include/linux/compaction.h
> @@ -9,6 +9,7 @@ enum compact_priority {
>  	COMPACT_PRIO_SYNC_FULL,
>  	MIN_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_FULL,
>  	COMPACT_PRIO_SYNC_LIGHT,
> +	MIN_COMPACT_COSTLY_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
>  	DEF_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
>  	COMPACT_PRIO_ASYNC,
>  	INIT_COMPACT_PRIORITY = COMPACT_PRIO_ASYNC
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f8bed910e3cf..ff60a2837c58 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3165,6 +3165,7 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
>  		     int compaction_retries)
>  {
>  	int max_retries = MAX_COMPACT_RETRIES;
> +	int min_priority;
>  
>  	if (!order)
>  		return false;
> @@ -3204,7 +3205,9 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
>  	 * if we exhausted all retries at the lower priorities
>  	 */
>  check_priority:
> -	if (*compact_priority > MIN_COMPACT_PRIORITY) {
> +	min_priority = (order > PAGE_ALLOC_COSTLY_ORDER) ?
> +			MIN_COMPACT_COSTLY_PRIORITY : MIN_COMPACT_PRIORITY;
> +	if (*compact_priority > min_priority) {
>  		(*compact_priority)--;
>  		return true;
>  	}
> -- 
> 2.9.3

-- 
Michal Hocko
SUSE Labs

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  reply	other threads:[~2016-09-21 17:15 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-06 13:52 [PATCH 0/4] reintroduce compaction feedback for OOM decisions Vlastimil Babka
2016-09-06 13:52 ` Vlastimil Babka
2016-09-06 13:52 ` [PATCH 1/4] Revert "mm, oom: prevent premature OOM killer invocation for high order request" Vlastimil Babka
2016-09-06 13:52   ` Vlastimil Babka
2016-09-21 17:04   ` Michal Hocko
2016-09-21 17:04     ` Michal Hocko
2016-09-06 13:52 ` [PATCH 2/4] mm, compaction: more reliably increase direct compaction priority Vlastimil Babka
2016-09-06 13:52   ` Vlastimil Babka
2016-09-21 17:13   ` Michal Hocko
2016-09-21 17:13     ` Michal Hocko
2016-09-22 12:51     ` Vlastimil Babka
2016-09-22 12:51       ` Vlastimil Babka
2016-09-22 14:08       ` Michal Hocko
2016-09-22 14:08         ` Michal Hocko
2016-09-22 14:52         ` Michal Hocko
2016-09-22 14:52           ` Michal Hocko
2016-09-22 14:59           ` Vlastimil Babka
2016-09-22 14:59             ` Vlastimil Babka
2016-09-22 15:06           ` Vlastimil Babka
2016-09-22 15:06             ` Vlastimil Babka
2016-09-23  4:04             ` Hillf Danton
2016-09-23  4:04               ` Hillf Danton
2016-09-23  6:55               ` Vlastimil Babka
2016-09-23  6:55                 ` Vlastimil Babka
2016-09-23  8:23                 ` Michal Hocko
2016-09-23  8:23                   ` Michal Hocko
2016-09-23 10:47                   ` Vlastimil Babka
2016-09-23 10:47                     ` Vlastimil Babka
2016-09-23 12:06                     ` Michal Hocko
2016-09-23 12:06                       ` Michal Hocko
2016-09-06 13:52 ` [PATCH 3/4] mm, compaction: restrict full priority to non-costly orders Vlastimil Babka
2016-09-06 13:52   ` Vlastimil Babka
2016-09-21 17:15   ` Michal Hocko [this message]
2016-09-21 17:15     ` Michal Hocko
2016-09-06 13:52 ` [PATCH 4/4] mm, compaction: make full priority ignore pageblock suitability Vlastimil Babka
2016-09-06 13:52   ` Vlastimil Babka
2016-09-15 18:51 ` [PATCH 0/4] reintroduce compaction feedback for OOM decisions Arkadiusz Miskiewicz
2016-09-15 18:51   ` Arkadiusz Miskiewicz
2016-09-21 17:18 ` Michal Hocko
2016-09-21 17:18   ` Michal Hocko
2016-09-22 15:18   ` Vlastimil Babka
2016-09-22 15:18     ` Vlastimil Babka
2016-09-23  8:26     ` Michal Hocko
2016-09-23  8:26       ` Michal Hocko
2016-09-23 10:55       ` Vlastimil Babka
2016-09-23 10:55         ` Vlastimil Babka
2016-09-23 12:09         ` Michal Hocko
2016-09-23 12:09           ` Michal Hocko

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