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Groups > linux.kernel > #1424958 > unrolled thread
| Started by | Vlastimil Babka <vbabka@suse.cz> |
|---|---|
| First post | 2016-06-17 13:30 +0200 |
| Last post | 2016-06-17 14:10 +0200 |
| Articles | 2 — 2 participants |
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Re: [PATCH 24/27] mm, page_alloc: Remove fair zone allocation policy Vlastimil Babka <vbabka@suse.cz> - 2016-06-17 13:30 +0200
Re: [PATCH 24/27] mm, page_alloc: Remove fair zone allocation policy Mel Gorman <mgorman@techsingularity.net> - 2016-06-17 14:10 +0200
| From | Vlastimil Babka <vbabka@suse.cz> |
|---|---|
| Date | 2016-06-17 13:30 +0200 |
| Subject | Re: [PATCH 24/27] mm, page_alloc: Remove fair zone allocation policy |
| Message-ID | <rL08i-5Sp-21@gated-at.bofh.it> |
On 06/09/2016 08:04 PM, Mel Gorman wrote: > The fair zone allocation policy interleaves allocation requests between > zones to avoid an age inversion problem whereby new pages are reclaimed > to balance a zone. Reclaim is now node-based so this should no longer be > an issue and the fair zone allocation policy is not free. This patch > removes it. I wonder if fair zone allocation had the side effect of preventing e.g. a small Normal zone to be almost fully occupied by long-lived unreclaimable allocations early in the kernel lifetime. So that might be one thing to watch out for. But otherwise I would agree it should be no longer needed with node-based reclaim. > Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz>
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| From | Mel Gorman <mgorman@techsingularity.net> |
|---|---|
| Date | 2016-06-17 14:10 +0200 |
| Message-ID | <rL0L0-6mx-29@gated-at.bofh.it> |
| In reply to | #1424958 |
On Fri, Jun 17, 2016 at 01:27:09PM +0200, Vlastimil Babka wrote: > On 06/09/2016 08:04 PM, Mel Gorman wrote: > >The fair zone allocation policy interleaves allocation requests between > >zones to avoid an age inversion problem whereby new pages are reclaimed > >to balance a zone. Reclaim is now node-based so this should no longer be > >an issue and the fair zone allocation policy is not free. This patch > >removes it. > > I wonder if fair zone allocation had the side effect of preventing e.g. a > small Normal zone to be almost fully occupied by long-lived unreclaimable > allocations early in the kernel lifetime. So that might be one thing to > watch out for. It's a marginal corner case and the zonelist scan is slightly inefficient as the first zone is always skipped but the impact is light. > But otherwise I would agree it should be no longer needed > with node-based reclaim. > > >Signed-off-by: Mel Gorman <mgorman@techsingularity.net> > > Acked-by: Vlastimil Babka <vbabka@suse.cz> > Thanks. -- Mel Gorman SUSE Labs
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