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Date: Wed, 4 Feb 2009 18:55:01 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: "Swamy Gowda" <swamy@...ident.com>, <linux-kernel@...r.kernel.org>, cl@...ux-foundation.org, Brice.Goglin@...ia.fr, "linux-mm@...ck.org" <linux-mm@...ck.org> Subject: [RFC][PATCH] release mmap_sem before starting migration (Was Re: Need to take mmap_sem lock in move_pages. On Wed, 4 Feb 2009 18:40:28 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote: > On Wed, 4 Feb 2009 18:36:00 +0900 > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote: > Maybe up_read() can be moved before do_migrate_pages(), I think. > How about this ? == mmap_sem can be released after page table walk ends. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: mmotm-2.6.29-Feb03/mm/migrate.c =================================================================== --- mmotm-2.6.29-Feb03.orig/mm/migrate.c +++ mmotm-2.6.29-Feb03/mm/migrate.c @@ -875,13 +875,13 @@ put_and_set: set_status: pp->status = err; } + up_read(&mm->mmap_sem); err = 0; if (!list_empty(&pagelist)) err = migrate_pages(&pagelist, new_page_node, (unsigned long)pm); - up_read(&mm->mmap_sem); return err; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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