Re: mm performance with zram

[Luigi Semenzato <semenzato@google.com>]

Thank you!  I am using perf version 3.13.11.10, will look for newer versions.

On Fri, Jan 9, 2015 at 4:06 PM, Joonsoo Kim <js1304@gmail.com> wrote:
> 2015-01-10 1:45 GMT+09:00 Luigi Semenzato <semenzato@google.com>:
>> On Thu, Jan 8, 2015 at 10:30 PM, Andrew Morton
>> <akpm@linux-foundation.org> wrote:
>>> On Thu, 8 Jan 2015 14:49:45 -0800 Luigi Semenzato <semenzato@google.com> wrote:
>>>
>>>> I am taking a closer look at the performance of the Linux MM in the
>>>> context of heavy zram usage.  The bottom line is that there is
>>>> surprisingly high overhead (35-40%) from MM code other than
>>>> compression/decompression routines.
>>>
>>> Those images hurt my eyes.
>>
>> Sorry about that.  I didn't find other ways of computing the
>> cumulative cost of functions (i.e. time spent in a function and all
>> its descendants, like in gprof).  I couldn't get perf to do that
>> either.  A flat profile shows most functions take a fracion of 1%, so
>> it's not useful.  If anybody knows a better way I'll be glad to use
>> it.
>
> Hello,
>
> Recent version of perf has an ability to compute cumulative cost of functions.
> And, it's a default configuration. :)
> If you change your perf to recent version, you can easily get the data.
>
> Thanks.

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