From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f52.google.com (mail-pa0-f52.google.com [209.85.220.52]) by kanga.kvack.org (Postfix) with ESMTP id BF4806B0071 for ; Thu, 12 Feb 2015 11:20:18 -0500 (EST) Received: by mail-pa0-f52.google.com with SMTP id ey11so12349832pad.11 for ; Thu, 12 Feb 2015 08:20:18 -0800 (PST) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTP id dh1si1708434pbc.142.2015.02.12.08.20.12 for ; Thu, 12 Feb 2015 08:20:12 -0800 (PST) From: "Kirill A. Shutemov" Subject: [PATCHv3 13/24] mm, vmstats: new THP splitting event Date: Thu, 12 Feb 2015 18:18:27 +0200 Message-Id: <1423757918-197669-14-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1423757918-197669-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1423757918-197669-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Andrea Arcangeli , Hugh Dickins Cc: Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" The patch replaces THP_SPLIT with tree events: THP_SPLIT_PAGE, THP_SPLIT_PAGE_FAILT and THP_SPLIT_PMD. It reflects the fact that we now can split PMD without the compound page and that split_huge_page() can fail. Signed-off-by: Kirill A. Shutemov --- include/linux/vm_event_item.h | 4 +++- mm/huge_memory.c | 3 +++ mm/vmstat.c | 4 +++- 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 2b1cef88b827..3261bfe2156a 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -69,7 +69,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, THP_FAULT_FALLBACK, THP_COLLAPSE_ALLOC, THP_COLLAPSE_ALLOC_FAILED, - THP_SPLIT, + THP_SPLIT_PAGE, + THP_SPLIT_PAGE_FAILED, + THP_SPLIT_PMD, THP_ZERO_PAGE_ALLOC, THP_ZERO_PAGE_ALLOC_FAILED, #endif diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 46c3cd26f837..b5c1976e2a65 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1644,6 +1644,8 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, BUG_ON(vma->vm_start > haddr || vma->vm_end < haddr + HPAGE_PMD_SIZE); + count_vm_event(THP_SPLIT_PMD); + if (is_huge_zero_pmd(*pmd)) return __split_huge_zero_page_pmd(vma, haddr, pmd); @@ -1917,6 +1919,7 @@ static void __split_huge_page(struct page *page, */ int split_huge_page_to_list(struct page *page, struct list_head *list) { + count_vm_event(THP_SPLIT_PAGE_FAILED); return -EBUSY; } diff --git a/mm/vmstat.c b/mm/vmstat.c index 1fd0886a389f..e1c87425fe11 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -821,7 +821,9 @@ const char * const vmstat_text[] = { "thp_fault_fallback", "thp_collapse_alloc", "thp_collapse_alloc_failed", - "thp_split", + "thp_split_page", + "thp_split_page_failed", + "thp_split_pmd", "thp_zero_page_alloc", "thp_zero_page_alloc_failed", #endif -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org