linux-kernel - Re: [PATCHv2, RFC 12/30] thp, mm: add event counters for huge page alloc on write to a file

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Message-ID: <514B4A9F.5090004@sr71.net>
Date:	Thu, 21 Mar 2013 10:59:59 -0700
From:	Dave Hansen <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2, RFC 12/30] thp, mm: add event counters for huge page
 alloc on write to a file

On 03/14/2013 10:50 AM, Kirill A. Shutemov wrote:
> --- a/include/linux/vm_event_item.h
> +++ b/include/linux/vm_event_item.h
> @@ -71,6 +71,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
>  		THP_FAULT_FALLBACK,
>  		THP_COLLAPSE_ALLOC,
>  		THP_COLLAPSE_ALLOC_FAILED,
> +		THP_WRITE_ALLOC,
> +		THP_WRITE_FAILED,
>  		THP_SPLIT,
>  		THP_ZERO_PAGE_ALLOC,
>  		THP_ZERO_PAGE_ALLOC_FAILED,

I think these names are a bit terse.  It's certainly not _writes_ that
are failing and "THP_WRITE_FAILED" makes it sound that way.  Also, why
do we need to differentiate these from the existing anon-hugepage vm
stats?  The alloc_pages() call seems to be doing the exact same thing in
the end.  Is one more likely to succeed than the other?
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