From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: [PATCH 14/22] HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs Date: Mon, 15 Jun 2009 10:45:34 +0800 Message-ID: <20090615031254.293225180@intel.com> References: <20090615024520.786814520@intel.com> Return-path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with SMTP id 8004F6B005A for ; Sun, 14 Jun 2009 23:14:27 -0400 (EDT) Content-Disposition: inline; filename=pfn-inject Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: LKML , Andi Kleen , Ingo Molnar , Mel Gorman , "Wu, Fengguang" , Thomas Gleixner , "H. Peter Anvin" , Peter Zijlstra , Nick Piggin , Hugh Dickins , Andi Kleen , "riel@redhat.com" , "chris.mason@oracle.com" , "linux-mm@kvack.org" List-Id: linux-mm.kvack.org From: Andi Kleen Useful for some testing scenarios, although specific testing is often done better through MADV_POISON This can be done with the x86 level MCE injector too, but this interface allows it to do independently from low level x86 changes. Open issues: Should be disabled for cgroups. Signed-off-by: Andi Kleen --- mm/Kconfig | 4 ++++ mm/Makefile | 1 + mm/hwpoison-inject.c | 41 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 46 insertions(+) --- /dev/null +++ sound-2.6/mm/hwpoison-inject.c @@ -0,0 +1,41 @@ +/* Inject a hwpoison memory failure on a arbitary pfn */ +#include +#include +#include +#include + +static struct dentry *hwpoison_dir, *corrupt_pfn; + +static int hwpoison_inject(void *data, u64 val) +{ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + printk(KERN_INFO "Injecting memory failure at pfn %Lx\n", val); + memory_failure(val, 18); + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n"); + +static void pfn_inject_exit(void) +{ + if (hwpoison_dir) + debugfs_remove_recursive(hwpoison_dir); +} + +static int pfn_inject_init(void) +{ + hwpoison_dir = debugfs_create_dir("hwpoison", NULL); + if (hwpoison_dir == NULL) + return -ENOMEM; + corrupt_pfn = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir, + NULL, &hwpoison_fops); + if (corrupt_pfn == NULL) { + pfn_inject_exit(); + return -ENOMEM; + } + return 0; +} + +module_init(pfn_inject_init); +module_exit(pfn_inject_exit); --- sound-2.6.orig/mm/Kconfig +++ sound-2.6/mm/Kconfig @@ -242,6 +242,10 @@ config KSM config MEMORY_FAILURE bool +config HWPOISON_INJECT + tristate "Poison pages injector" + depends on MEMORY_FAILURE && DEBUG_KERNEL + config NOMMU_INITIAL_TRIM_EXCESS int "Turn on mmap() excess space trimming before booting" depends on !MMU --- sound-2.6.orig/mm/Makefile +++ sound-2.6/mm/Makefile @@ -43,5 +43,6 @@ endif obj-$(CONFIG_QUICKLIST) += quicklist.o obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o +obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o -- -- 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