Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757923AbZFCSuc (ORCPT ); Wed, 3 Jun 2009 14:50:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755514AbZFCSrT (ORCPT ); Wed, 3 Jun 2009 14:47:19 -0400 Received: from one.firstfloor.org ([213.235.205.2]:37878 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755496AbZFCSrP (ORCPT ); Wed, 3 Jun 2009 14:47:15 -0400 From: Andi Kleen References: <20090603846.816684333@firstfloor.org> In-Reply-To: <20090603846.816684333@firstfloor.org> To: akpm@linux-foundation.org, npiggin@suse.de, linux-kernel@vger.kernel.org, linux-mm@kvack.org, fengguang.wu@intel.com Subject: [PATCH] [16/16] HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs Message-Id: <20090603184652.2A5461D0293@basil.firstfloor.org> Date: Wed, 3 Jun 2009 20:46:51 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3011 Lines: 96 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(+) Index: linux/mm/hwpoison-inject.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux/mm/hwpoison-inject.c 2009-06-03 20:30:47.000000000 +0200 @@ -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); Index: linux/mm/Kconfig =================================================================== --- linux.orig/mm/Kconfig 2009-06-03 20:30:47.000000000 +0200 +++ linux/mm/Kconfig 2009-06-03 20:30:47.000000000 +0200 @@ -225,6 +225,10 @@ default y depends on MMU +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 Index: linux/mm/Makefile =================================================================== --- linux.orig/mm/Makefile 2009-06-03 20:30:30.000000000 +0200 +++ linux/mm/Makefile 2009-06-03 20:30:47.000000000 +0200 @@ -43,5 +43,6 @@ 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 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/