From: Mel Gorman <mgorman@suse.de>
To: Hillf Danton <hdanton@sina.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH 1/3] mm, reclaim: make should_continue_reclaim perform dryrun detection
Date: Fri, 26 Jul 2019 09:12:25 +0100 [thread overview]
Message-ID: <20190726081225.GF2708@suse.de> (raw)
In-Reply-To: <20190725080551.GB2708@suse.de>
> From: Hillf Danton <hdanton@sina.com>
> Subject: [RFC PATCH 1/3] mm, reclaim: make should_continue_reclaim perform dryrun detection
>
> Address the issue of should_continue_reclaim continuing true too often
> for __GFP_RETRY_MAYFAIL attempts when !nr_reclaimed and nr_scanned.
> This could happen during hugetlb page allocation causing stalls for
> minutes or hours.
>
> We can stop reclaiming pages if compaction reports it can make a progress.
> A code reshuffle is needed to do that. And it has side-effects, however,
> with allocation latencies in other cases but that would come at the cost
> of potential premature reclaim which has consequences of itself.
>
> We can also bail out of reclaiming pages if we know that there are not
> enough inactive lru pages left to satisfy the costly allocation.
>
> We can give up reclaiming pages too if we see dryrun occur, with the
> certainty of plenty of inactive pages. IOW with dryrun detected, we are
> sure we have reclaimed as many pages as we could.
>
> Cc: Mike Kravetz <mike.kravetz@oracle.com>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Hillf Danton <hdanton@sina.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Thanks Hillf
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2019-07-26 8:12 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 17:50 [RFC PATCH 0/3] fix hugetlb page allocation stalls Mike Kravetz
2019-07-24 17:50 ` [RFC PATCH 1/3] mm, reclaim: make should_continue_reclaim perform dryrun detection Mike Kravetz
2019-07-25 8:05 ` Mel Gorman
2019-07-26 8:12 ` Mel Gorman [this message]
2019-07-31 11:08 ` Vlastimil Babka
2019-07-31 12:25 ` Mel Gorman
2019-07-31 21:11 ` Mike Kravetz
2019-08-01 8:44 ` Vlastimil Babka
2019-07-24 17:50 ` [RFC PATCH 2/3] mm, compaction: use MIN_COMPACT_COSTLY_PRIORITY everywhere for costly orders Mike Kravetz
2019-07-25 8:06 ` Mel Gorman
2019-07-31 12:06 ` Vlastimil Babka
2019-07-31 20:30 ` Mike Kravetz
2019-08-01 13:01 ` Vlastimil Babka
2019-08-01 20:33 ` Mike Kravetz
2019-08-02 10:20 ` Vlastimil Babka
2019-08-02 12:05 ` Vlastimil Babka
2019-08-02 17:44 ` Mike Kravetz
2019-07-24 17:50 ` [RFC PATCH 3/3] hugetlbfs: don't retry when pool page allocations start to fail Mike Kravetz
2019-07-25 8:13 ` Mel Gorman
2019-07-25 17:15 ` Mike Kravetz
2019-07-25 22:43 ` Mel Gorman
2019-07-31 13:23 ` Vlastimil Babka
2019-07-31 21:13 ` Mike Kravetz
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