From: Andrea Arcangeli <aarcange@redhat.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 8/8] Add VM counters for transparent hugepages
Date: Fri, 25 Feb 2011 00:14:49 +0100 [thread overview]
Message-ID: <20110224231449.GE23252@random.random> (raw)
In-Reply-To: <1298587384.9138.23.camel@nimitz>
On Thu, Feb 24, 2011 at 02:43:04PM -0800, Dave Hansen wrote:
> On Tue, 2011-02-22 at 17:52 -0800, Andi Kleen wrote:
> > @@ -2286,6 +2290,9 @@ void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd)
> > spin_unlock(&mm->page_table_lock);
> > return;
> > }
> > +
> > + count_vm_event(THP_SPLIT);
> > +
> > page = pmd_page(*pmd);
> > VM_BUG_ON(!page_count(page));
> > get_page(page);
>
> Hey Andi,
>
> Your split counter tracks the split_huge_page_pmd() calls, but misses
> plain split_huge_page() calls. Did you do this on purpose? Could we
> move the counter in to the low-level split function like below?
Agreed, I already noticed and posted this same change in Message-ID:
20110224041851.GF31195
> diff -puN mm/huge_memory.c~move-THP_SPLIT mm/huge_memory.c
> --- linux-2.6.git/mm/huge_memory.c~move-THP_SPLIT 2011-02-24 14:37:32.825288409 -0800
> +++ linux-2.6.git-dave/mm/huge_memory.c 2011-02-24 14:39:01.767939971 -0800
> @@ -1342,6 +1342,8 @@ static void __split_huge_page(struct pag
> BUG_ON(!PageHead(page));
> BUG_ON(PageTail(page));
>
> + count_vm_event(THP_SPLIT);
> +
> mapcount = 0;
> list_for_each_entry(avc, &anon_vma->head, same_anon_vma) {
> struct vm_area_struct *vma = avc->vma;
I've a micropreference in having it in split_huge_page succeeding path
after __split_huge_page returns, as the __ function is where the
brainer code is and statcode to me is annoying to read mixed in the
more complex code. Not that it makes any practical difference though.
next prev parent reply other threads:[~2011-02-24 23:15 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-23 1:51 Fix NUMA problems in transparent hugepages v2 Andi Kleen
2011-02-23 1:51 ` [PATCH 1/8] Fix interleaving for " Andi Kleen
2011-02-23 19:26 ` Christoph Lameter
2011-02-24 23:23 ` Andrea Arcangeli
2011-02-23 1:51 ` [PATCH 2/8] Change alloc_pages_vma to pass down the policy node for local policy Andi Kleen
2011-02-23 1:51 ` [PATCH 3/8] Add alloc_page_vma_node Andi Kleen
2011-02-23 1:51 ` [PATCH 4/8] Preserve original node for transparent huge page copies Andi Kleen
2011-02-23 1:51 ` [PATCH 5/8] Use correct numa policy node for transparent hugepages Andi Kleen
2011-02-23 1:52 ` [PATCH 6/8] Add __GFP_OTHER_NODE flag Andi Kleen
2011-02-23 1:52 ` [PATCH 7/8] Use GFP_OTHER_NODE for transparent huge pages Andi Kleen
2011-02-24 4:56 ` Andrea Arcangeli
2011-02-23 1:52 ` [PATCH 8/8] Add VM counters for transparent hugepages Andi Kleen
2011-02-24 4:18 ` Andrea Arcangeli
2011-02-24 22:43 ` Dave Hansen
2011-02-24 23:15 ` Andrea Arcangeli
2011-02-24 22:43 ` Dave Hansen
2011-02-24 23:14 ` Andrea Arcangeli [this message]
2011-02-25 1:36 ` Andi Kleen
2011-02-25 0:51 ` Andrea Arcangeli
2011-02-25 1:12 ` Andi Kleen
2011-02-25 1:34 ` Andrea Arcangeli
-- strict thread matches above, loose matches on Subject: below --
2011-03-03 19:59 Fix NUMA problems in transparent hugepages and KSM Andi Kleen
2011-03-03 19:59 ` [PATCH 8/8] Add VM counters for transparent hugepages Andi Kleen
2011-03-07 8:28 ` KOSAKI Motohiro
2011-03-07 16:35 ` Andi Kleen
2011-03-08 2:43 ` KOSAKI Motohiro
2011-03-30 21:45 ` Andrew Morton
2011-03-30 23:30 ` Andi Kleen
2011-03-31 0:52 ` KOSAKI Motohiro
2011-03-31 0:56 ` Andi Kleen
2011-03-03 0:45 Fix NUMA problems in transparent hugepages and KSM Andi Kleen
2011-03-03 0:45 ` [PATCH 8/8] Add VM counters for transparent hugepages Andi Kleen
2011-03-03 9:18 ` Johannes Weiner
2011-03-03 18:09 ` Andi Kleen
2011-02-21 19:07 Fix NUMA problems in transparent hugepages and KSM Andi Kleen
2011-02-21 19:07 ` [PATCH 8/8] Add VM counters for transparent hugepages Andi Kleen
2011-02-22 16:36 ` Dave Hansen
2011-02-22 16:43 ` Andrea Arcangeli
2011-02-22 18:02 ` Andi Kleen
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