linux-kernel - Re: [RFC][PATCH] show page size in /proc/$pid/numa

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Message-ID: <alpine.DEB.2.00.1109221339520.31548@chino.kir.corp.google.com>
Date:	Thu, 22 Sep 2011 13:43:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] show page size in /proc/$pid/numa_maps

On Wed, 21 Sep 2011, Dave Hansen wrote:

> 
> The output of /proc/$pid/numa_maps is in terms of number of pages
> like anon=22 or dirty=54.  Here's some output:
> 
> 7f4680000000 default file=/hugetlb/bigfile anon=50 dirty=50 N0=50
> 7f7659600000 default file=/anon_hugepage\040(deleted) anon=50 dirty=50 N0=50
> 7fff8d425000 default stack anon=50 dirty=50 N0=50
> 
> Looks like we have a stack and a couple of anonymous hugetlbfs
> areas page which both use the same amount of memory.  They don't.
> 
> The 'bigfile' uses 1GB pages and takes up ~50GB of space.  The
> anon_hugepage uses 2MB pages and takes up ~100MB of space while
> the stack uses normal 4k pages.  You can go over to smaps to
> figure out what the page size _really_ is with KernelPageSize
> or MMUPageSize.  But, I think this is a pretty nasty and
> counterintuitive interface as it stands.
> 
> The following patch adds a pagemult= field.  It is placed only
> in cases where the VMA's page size differs from the base kernel
> page size.  I'm calling it pagemult to emphasize that it is
> indended to modify the statistics output rather than _really_
> show the page size that the kernel or MMU is using.
> 

Why not just add a pagesize={4K,2M,1G,...} field for every output?
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