From: David Rientjes <rientjes@google.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch] mm, thp: restructure thp avoidance of light synchronous migration
Date: Mon, 28 Jul 2014 15:24:22 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.02.1407281523090.8998@chino.kir.corp.google.com> (raw)
In-Reply-To: <53D60F31.4050504@suse.cz>
On Mon, 28 Jul 2014, Vlastimil Babka wrote:
> Looks like kind of a shotgun approach to me. A single __GFP_NO_KSWAPD bullet
> is no longer enough, so we use all the flags and hope for the best. It seems
> THP has so many flags it should be unique for now, but I wonder if there is a
> better way to say how much an allocation is willing to wait.
>
We would have to introduce a new __GFP_FAULT bit to distinguish between
allocations at pagefault that should not use synchronous memory compaction
solely for this case, it's probably not worth it.
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prev parent reply other threads:[~2014-07-28 22:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-24 22:41 David Rientjes
2014-07-25 15:38 ` Mel Gorman
2014-07-28 8:52 ` Vlastimil Babka
2014-07-28 22:24 ` David Rientjes [this message]
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