Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed

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To: Aaron Lu <aaron.lu@xxxxxxxxx>
Subject: Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
From: "Figo.zhang" <figo1802@xxxxxxxxx>
Date: Tue, 20 Mar 2018 22:59:16 -0700
Cc: Linux MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Kemi Wang <kemi.wang@xxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>
In-reply-to: <20180321045353.GC28705@intel.com>
References: <20180320085452.24641-1-aaron.lu@intel.com> <20180320085452.24641-3-aaron.lu@intel.com> <CAF7GXvovKsabDw88icK5c5xBqg6g0TomQdspfi4ikjtbg=XzGQ@mail.gmail.com> <20180321015944.GB28705@intel.com> <CAF7GXvrQG0+iPu8h13coo2QW7WxNhjHA1JAaOYoEBBB9-obRSQ@mail.gmail.com> <20180321045353.GC28705@intel.com>

2018-03-20 21:53 GMT-07:00 Aaron Lu <aaron.lu@xxxxxxxxx>:

On Tue, Mar 20, 2018 at 09:21:33PM -0700, Figo.zhang wrote:
> suppose that in free_one_page() will try to merge to high order anytime ,
> but now in your patch,
> those merge has postponed when system in low memory status, it is very easy
> let system trigger
> low memory state and get poor performance.

Merge or not merge, the size of free memory is not affected.

yes, the total free memory is not impact, but will influence the higher order allocation.

Follow-Ups:
- Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
  - From: Aaron Lu

References:
- [RFC PATCH v2 0/4] Eliminate zone->lock contention for will-it-scale/page_fault1 and parallel free
  - From: Aaron Lu
- [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
  - From: Aaron Lu
- Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
  - From: Figo.zhang
- Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
  - From: Aaron Lu
- Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
  - From: Figo.zhang
- Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0 page unless compaction failed
  - From: Aaron Lu

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