From: Hugh Dickins <hughd@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mel@csn.ul.ie>, Rik van Riel <riel@redhat.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>, Andi Kleen <ak@linux.intel.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm: fix hugepage migration in the same way Date: Mon, 10 Jan 2011 23:10:21 -0800 (PST) [thread overview] Message-ID: <alpine.LSU.2.00.1101102308310.24988@sister.anvils> (raw) In-Reply-To: <alpine.LSU.2.00.1101102259160.24988@sister.anvils> 2.6.37 added an unmap_and_move_huge_page() for memory failure recovery, but its anon_vma handling was still based around the 2.6.35 conventions. Update it to use page_lock_anon_vma, get_anon_vma, page_unlock_anon_vma, drop_anon_vma in the same way as we're now changing unmap_and_move(). Signed-off-by: Hugh Dickins <hughd@google.com> Cc: stable@kernel.org [2.6.37] --- I don't particularly like to propose this for stable when I've not seen its problems in practice nor tested the solution: but it's clearly out of synch at present. mm/migrate.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) --- 2.6.37/mm/migrate.c 2011-01-10 17:23:39.000000000 -0800 +++ linux/mm/migrate.c 2011-01-10 22:01:16.000000000 -0800 @@ -806,7 +806,6 @@ static int unmap_and_move_huge_page(new_ int rc = 0; int *result = NULL; struct page *new_hpage = get_new_page(hpage, private, &result); - int rcu_locked = 0; struct anon_vma *anon_vma = NULL; if (!new_hpage) @@ -821,12 +820,10 @@ static int unmap_and_move_huge_page(new_ } if (PageAnon(hpage)) { - rcu_read_lock(); - rcu_locked = 1; - - if (page_mapped(hpage)) { - anon_vma = page_anon_vma(hpage); - atomic_inc(&anon_vma->external_refcount); + anon_vma = page_lock_anon_vma(hpage); + if (anon_vma) { + get_anon_vma(anon_vma); + page_unlock_anon_vma(anon_vma); } } @@ -838,16 +835,8 @@ static int unmap_and_move_huge_page(new_ if (rc) remove_migration_ptes(hpage, hpage); - if (anon_vma && atomic_dec_and_lock(&anon_vma->external_refcount, - &anon_vma->lock)) { - int empty = list_empty(&anon_vma->head); - spin_unlock(&anon_vma->lock); - if (empty) - anon_vma_free(anon_vma); - } - - if (rcu_locked) - rcu_read_unlock(); + if (anon_vma) + drop_anon_vma(anon_vma); out: unlock_page(hpage);
WARNING: multiple messages have this Message-ID (diff)
From: Hugh Dickins <hughd@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mel@csn.ul.ie>, Rik van Riel <riel@redhat.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Jun'ichi Nomura <j-nomura@ce.jp.nec.com>, Andi Kleen <ak@linux.intel.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm: fix hugepage migration in the same way Date: Mon, 10 Jan 2011 23:10:21 -0800 (PST) [thread overview] Message-ID: <alpine.LSU.2.00.1101102308310.24988@sister.anvils> (raw) In-Reply-To: <alpine.LSU.2.00.1101102259160.24988@sister.anvils> 2.6.37 added an unmap_and_move_huge_page() for memory failure recovery, but its anon_vma handling was still based around the 2.6.35 conventions. Update it to use page_lock_anon_vma, get_anon_vma, page_unlock_anon_vma, drop_anon_vma in the same way as we're now changing unmap_and_move(). Signed-off-by: Hugh Dickins <hughd@google.com> Cc: stable@kernel.org [2.6.37] --- I don't particularly like to propose this for stable when I've not seen its problems in practice nor tested the solution: but it's clearly out of synch at present. mm/migrate.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) --- 2.6.37/mm/migrate.c 2011-01-10 17:23:39.000000000 -0800 +++ linux/mm/migrate.c 2011-01-10 22:01:16.000000000 -0800 @@ -806,7 +806,6 @@ static int unmap_and_move_huge_page(new_ int rc = 0; int *result = NULL; struct page *new_hpage = get_new_page(hpage, private, &result); - int rcu_locked = 0; struct anon_vma *anon_vma = NULL; if (!new_hpage) @@ -821,12 +820,10 @@ static int unmap_and_move_huge_page(new_ } if (PageAnon(hpage)) { - rcu_read_lock(); - rcu_locked = 1; - - if (page_mapped(hpage)) { - anon_vma = page_anon_vma(hpage); - atomic_inc(&anon_vma->external_refcount); + anon_vma = page_lock_anon_vma(hpage); + if (anon_vma) { + get_anon_vma(anon_vma); + page_unlock_anon_vma(anon_vma); } } @@ -838,16 +835,8 @@ static int unmap_and_move_huge_page(new_ if (rc) remove_migration_ptes(hpage, hpage); - if (anon_vma && atomic_dec_and_lock(&anon_vma->external_refcount, - &anon_vma->lock)) { - int empty = list_empty(&anon_vma->head); - spin_unlock(&anon_vma->lock); - if (empty) - anon_vma_free(anon_vma); - } - - if (rcu_locked) - rcu_read_unlock(); + if (anon_vma) + drop_anon_vma(anon_vma); out: unlock_page(hpage); -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-01-11 7:10 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-01-11 7:08 [PATCH] mm: fix migration hangs on anon_vma lock Hugh Dickins 2011-01-11 7:08 ` Hugh Dickins 2011-01-11 7:10 ` Hugh Dickins [this message] 2011-01-11 7:10 ` [PATCH] mm: fix hugepage migration in the same way Hugh Dickins 2011-01-11 11:44 ` [PATCH] mm: fix migration hangs on anon_vma lock Mel Gorman 2011-01-11 11:44 ` Mel Gorman 2011-01-11 20:35 ` Rik van Riel 2011-01-11 20:35 ` Rik van Riel
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