Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753363AbbLDPRK (ORCPT ); Fri, 4 Dec 2015 10:17:10 -0500 Received: from mx2.suse.de ([195.135.220.15]:53021 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751185AbbLDPRH (ORCPT ); Fri, 4 Dec 2015 10:17:07 -0500 From: Vlastimil Babka To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Andrew Morton , Joonsoo Kim , Minchan Kim , Sasha Levin , "Kirill A. Shutemov" , Mel Gorman , Michal Hocko , Vlastimil Babka , Rasmus Villemoes Subject: [PATCH v2 3/3] mm, debug: move bad flags printing to bad_page() Date: Fri, 4 Dec 2015 16:16:35 +0100 Message-Id: <1449242195-16374-3-git-send-email-vbabka@suse.cz> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1449242195-16374-1-git-send-email-vbabka@suse.cz> References: <87io4hi06n.fsf@rasmusvillemoes.dk> <1449242195-16374-1-git-send-email-vbabka@suse.cz> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4041 Lines: 115 Since bad_page() is the only user of the badflags parameter of dump_page_badflags(), we can move the code to bad_page() and simplify a bit. The dump_page_badflags() function is renamed to __dump_page() and can still be called separately from dump_page() for temporary debug prints where page_owner info is not desired. The only user-visible change is that page->mem_cgroup is printed before the bad flags. Signed-off-by: Vlastimil Babka Cc: Joonsoo Kim Cc: Minchan Kim Cc: Sasha Levin Cc: "Kirill A. Shutemov" Cc: Mel Gorman Cc: Michal Hocko --- include/linux/mmdebug.h | 3 +-- mm/debug.c | 14 +++----------- mm/page_alloc.c | 10 +++++++--- 3 files changed, 11 insertions(+), 16 deletions(-) diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h index 2c8286cf162e..9b0dc2161f7a 100644 --- a/include/linux/mmdebug.h +++ b/include/linux/mmdebug.h @@ -14,8 +14,7 @@ extern const struct trace_print_flags vmaflag_names[]; extern const struct trace_print_flags gfpflag_names[]; extern void dump_page(struct page *page, const char *reason); -extern void dump_page_badflags(struct page *page, const char *reason, - unsigned long badflags); +extern void __dump_page(struct page *page, const char *reason); void dump_vma(const struct vm_area_struct *vma); void dump_mm(const struct mm_struct *mm); diff --git a/mm/debug.c b/mm/debug.c index c42bb4c13c2d..d36aa66e9779 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -109,25 +109,17 @@ const struct trace_print_flags gfpflag_names[] = { {0, NULL}, }; -void dump_page_badflags(struct page *page, const char *reason, - unsigned long badflags) +void __dump_page(struct page *page, const char *reason) { - unsigned long printflags = page->flags; - pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n", page, atomic_read(&page->_count), page_mapcount(page), page->mapping, page->index); BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1); - pr_emerg("flags: %#lx(%pgp)\n", printflags, &printflags); + pr_emerg("flags: %#lx(%pgp)\n", page->flags, &page->flags); if (reason) pr_alert("page dumped because: %s\n", reason); - if (page->flags & badflags) { - printflags = page->flags & badflags; - pr_alert("bad because of flags: %#lx(%pgp)\n", printflags, - &printflags); - } #ifdef CONFIG_MEMCG if (page->mem_cgroup) pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup); @@ -136,7 +128,7 @@ void dump_page_badflags(struct page *page, const char *reason, void dump_page(struct page *page, const char *reason) { - dump_page_badflags(page, reason, 0); + __dump_page(page, reason); dump_page_owner(page); } EXPORT_SYMBOL(dump_page); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index bd94c7465dea..2388496a7c6c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -435,7 +435,7 @@ static void bad_page(struct page *page, const char *reason, goto out; } if (nr_unshown) { - printk(KERN_ALERT + pr_alert( "BUG: Bad page state: %lu messages suppressed\n", nr_unshown); nr_unshown = 0; @@ -445,9 +445,13 @@ static void bad_page(struct page *page, const char *reason, if (nr_shown++ == 0) resume = jiffies + 60 * HZ; - printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n", + pr_alert("BUG: Bad page state in process %s pfn:%05lx\n", current->comm, page_to_pfn(page)); - dump_page_badflags(page, reason, bad_flags); + __dump_page(page, reason); + bad_flags &= page->flags; + if (bad_flags) + pr_alert("bad because of flags: %#lx(%pgp)\n", + bad_flags, &bad_flags); dump_page_owner(page); print_modules(); -- 2.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/