Re: [patch] mm: more likely reclaim MADV_SEQUENTIAL mappings II

[Rik van Riel <riel@redhat.com>]

KOSAKI Motohiro wrote:
>> mmotm:
>>     normal  user: 1.775000s [0.053307] system: 9.620000s [0.135339] total: 98.875000s [0.613956]
>>    madvise  user: 2.552500s [0.041307] system: 9.442500s [0.075980] total: 73.937500s [0.734170]
>> mmotm+patch:
>>     normal  user: 1.850000s [0.013540] system: 9.760000s [0.047081] total: 99.250000s [0.569386]
>>    madvise  user: 2.547500s [0.014930] system: 8.865000s [0.055000] total: 71.897500s [0.144763]
>>
>> Well, time-wise not sooo much of an improvement.  But given the
>> massively decreased LRU-rotation [ http://hannes.saeurebad.de/madvseq/ ]
> 
> My first impression, this result mean the patch is not so useful.
> But anyway, I mesured it again because I think Nick's opinion is very
> reasonable and I don't know your mesurement condition so detail.

It may not make much of a difference if the MADV_SEQUENTIAL
program is the only thing running on the system.

However, the goal of MADV_SEQUENTIAL is to make sure that a
streaming mapping does not kick the data from other programs
out of memory.  The patch should take care of that very well.

-- 
All rights reversed.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>