Re: [PATCH v2 1/1] mm: smaps: split PSS into components

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On Fri 31-05-19 08:22:06, Michal Hocko wrote:
> On Fri 31-05-19 08:04:01, Michal Hocko wrote:
> > [Please always Cc linux-api mailing list (now added) when adding a new
> > user visible API. Keeping the rest of the email intact for reference]
> > 
> > On Thu 30-05-19 17:26:33, semenzato@xxxxxxxxxxxx wrote:
> > > From: Luigi Semenzato <semenzato@xxxxxxxxxxxx>
> > > 
> > > Report separate components (anon, file, and shmem)
> > > for PSS in smaps_rollup.
> > > 
> > > This helps understand and tune the memory manager behavior
> > > in consumer devices, particularly mobile devices.  Many of
> > > them (e.g. chromebooks and Android-based devices) use zram
> > > for anon memory, and perform disk reads for discarded file
> > > pages.  The difference in latency is large (e.g. reading
> > > a single page from SSD is 30 times slower than decompressing
> > > a zram page on one popular device), thus it is useful to know
> > > how much of the PSS is anon vs. file.
> 
> Could you describe how exactly are those new counters going to be used?
> 
> I do not expect this to add a visible penalty to users who are not going
> to use the counter but have you tried to measure that?

Also forgot to mention that any change to smaps should be documented in
Documentation/filesystems/proc.txt.
-- 
Michal Hocko
SUSE Labs




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