linux-kernel - Re: [PATCH] lazy freeing of memory through MADV

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Date:	Sun, 22 Apr 2007 23:59:47 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Rik van Riel <riel@...hat.com>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, shak <dshaks@...hat.com>,
	jakub@...hat.com, drepper@...hat.com
Subject: Re: [PATCH] lazy freeing of memory through MADV_FREE

Rik van Riel wrote:
> Nick Piggin wrote:
>> Rik van Riel wrote:
>>> Nick Piggin wrote:
>>>
>>>> Rik van Riel wrote:
>>
>>>>> Here are the transactions/seconds for each combination:
> 
> I've added a 5th column, with just your mmap_sem patch and
> without my madv_free patch.  It is run with the glibc patch,
> which should make it fall back to MADV_DONTNEED after the
> first MADV_FREE call fails.
> 
>>>>>    vanilla   new glibc  madv_free kernel   madv_free + mmap_sem  
>>>>> mmap_sem
>>>>> threads
>>>>>
>>>>> 1     610         609             596                545         534
>>>>> 2    1032        1136            1196               1200        1180
>>>>> 4    1070        1128            2014               2024        2027
>>>>> 8    1000        1088            1665               2087        2089
>>>>> 16    779        1073            1310               1999        2012

Now that I think about it - this is all with the rawhide kernel
configuration, which has an ungodly number of debug config
options enabled.

I should try this with a more normal kernel, on various different
systems.

It would also be helpful if other people tried this same benchmark,
and others, on their systems.

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