linux-kernel - Re: [PATCH 8/8] Add VM counters for transparent hugepages

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Date:	Thu, 3 Mar 2011 19:09:46 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	aarcange@...hat.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 8/8] Add VM counters for transparent hugepages

On Thu, Mar 03, 2011 at 10:18:27AM +0100, Johannes Weiner wrote:
> On Wed, Mar 02, 2011 at 04:45:28PM -0800, Andi Kleen wrote:
> > --- a/include/linux/vmstat.h
> > +++ b/include/linux/vmstat.h
> > @@ -58,6 +58,13 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
> >  		UNEVICTABLE_PGCLEARED,	/* on COW, page truncate */
> >  		UNEVICTABLE_PGSTRANDED,	/* unable to isolate on unlock */
> >  		UNEVICTABLE_MLOCKFREED,
> > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> > +	        THP_FAULT_ALLOC,
> > +		THP_COLLAPSE_ALLOC,	
> > +		THP_FAULT_FALLBACK,	
> 
> Wouldn't this better be named THP_FAULT_ALLOC_FAIL?  After all, it
> counts allocation failures, not what results from them.

It doesn't really fail anything for the user, so I thought fallback
was better.

> 
> Secondly, the order does not match the strings, it will report the
> THP_COLLAPSE_ALLOC item as "thp_fault_fallback" and vice versa.


Oops, I broke that while merging Andrea's change. Will resend.

> Can you make this "_failed" instead, to match the enum symbol?  Andrea
> wasn't sure which was better, "failure" or "failed".  Right now, we
> have two instances of "fail" and two instances of "failed" in
> /proc/vmstat, it's probably best not to introduce a third one.

Okay.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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