Re: mm performance with zram

[Joonsoo Kim <js1304@gmail.com>]

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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