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authorHugh Dickins <hugh@veritas.com>2009-01-06 17:40:12 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 18:59:07 -0500
commitd936cf9b39b06c8d2e0d7fb5e7b4f176e18dec69 (patch)
treedb691451bc77e90b980b62674519731c6ece72db /mm/page_alloc.c
parentedc315fd222497ae4f4b959a9e31ada1e68a4755 (diff)
badpage: ratelimit print_bad_pte and bad_page
print_bad_pte() and bad_page() might each need ratelimiting - especially for their dump_stacks, almost never of interest, yet not quite dispensible. Correlating corruption across neighbouring entries can be very helpful, so allow a burst of 60 reports before keeping quiet for the remainder of that minute (or allow a steady drip of one report per second). Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 755c99a0ac71..d1a80f652c6f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -223,6 +223,30 @@ static inline int bad_range(struct zone *zone, struct page *page)
223 223
224static void bad_page(struct page *page) 224static void bad_page(struct page *page)
225{ 225{
226 static unsigned long resume;
227 static unsigned long nr_shown;
228 static unsigned long nr_unshown;
229
230 /*
231 * Allow a burst of 60 reports, then keep quiet for that minute;
232 * or allow a steady drip of one report per second.
233 */
234 if (nr_shown == 60) {
235 if (time_before(jiffies, resume)) {
236 nr_unshown++;
237 goto out;
238 }
239 if (nr_unshown) {
240 printk(KERN_EMERG
241 "Bad page state: %lu messages suppressed\n",
242 nr_unshown);
243 nr_unshown = 0;
244 }
245 nr_shown = 0;
246 }
247 if (nr_shown++ == 0)
248 resume = jiffies + 60 * HZ;
249
226 printk(KERN_EMERG "Bad page state in process %s pfn:%05lx\n", 250 printk(KERN_EMERG "Bad page state in process %s pfn:%05lx\n",
227 current->comm, page_to_pfn(page)); 251 current->comm, page_to_pfn(page));
228 printk(KERN_EMERG 252 printk(KERN_EMERG
@@ -232,7 +256,7 @@ static void bad_page(struct page *page)
232 printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n"); 256 printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n");
233 257
234 dump_stack(); 258 dump_stack();
235 259out:
236 /* Leave bad fields for debug, except PageBuddy could make trouble */ 260 /* Leave bad fields for debug, except PageBuddy could make trouble */
237 __ClearPageBuddy(page); 261 __ClearPageBuddy(page);
238 add_taint(TAINT_BAD_PAGE); 262 add_taint(TAINT_BAD_PAGE);