linux-kernel - Re: [PATCH v2 0/5] mm: support parallel free of memory

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Date:   Thu, 16 Mar 2017 14:38:44 -0500
From:   Alex Thorlton <alex.thorlton@....com>
To:     Aaron Lu <aaron.lu@...el.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tim Chen <tim.c.chen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ying Huang <ying.huang@...el.com>, <alex.thorlton@....com>
Subject: Re: [PATCH v2 0/5] mm: support parallel free of memory

On Wed, Mar 15, 2017 at 04:59:59PM +0800, Aaron Lu wrote:
> v2 changes: Nothing major, only minor ones.
>  - rebased on top of v4.11-rc2-mmotm-2017-03-14-15-41;
>  - use list_add_tail instead of list_add to add worker to tlb's worker
>    list so that when doing flush, the first queued worker gets flushed
>    first(based on the comsumption that the first queued worker has a
>    better chance of finishing its job than those later queued workers);
>  - use bool instead of int for variable free_batch_page in function
>    tlb_flush_mmu_free_batches;
>  - style change according to ./scripts/checkpatch;
>  - reword some of the changelogs to make it more readable.
> 
> v1 is here:
> https://lkml.org/lkml/2017/2/24/245

I tested v1 on a Haswell system with 64 sockets/1024 cores/2048 threads
and 8TB of RAM, with a 1TB malloc.  The average free() time for a 1TB
malloc on a vanilla kernel was 41.69s, the patched kernel averaged
21.56s for the same test.

I am testing v2 now and will report back with results in the next day or
so.

- Alex