Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754223Ab0A3SqT (ORCPT ); Sat, 30 Jan 2010 13:46:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753385Ab0A3SqS (ORCPT ); Sat, 30 Jan 2010 13:46:18 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:47073 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753014Ab0A3SqR (ORCPT ); Sat, 30 Jan 2010 13:46:17 -0500 From: "Rafael J. Wysocki" To: Maxim Levitsky , KOSAKI Motohiro Subject: Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable) Date: Sat, 30 Jan 2010 19:47:10 +0100 User-Agent: KMail/1.12.4 (Linux/2.6.33-rc6-rjw; KDE/4.3.5; x86_64; ; ) Cc: linux-pm@lists.linux-foundation.org, LKML , "linux-mm" , Andrew Morton , Benjamin Herrenschmidt References: <1263549544.3112.10.camel@maxim-laptop> <201001170138.37283.rjw@sisk.pl> <1264866419.27933.0.camel@maxim-laptop> In-Reply-To: <1264866419.27933.0.camel@maxim-laptop> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201001301947.10453.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5427 Lines: 170 On Saturday 30 January 2010, Maxim Levitsky wrote: > On Sun, 2010-01-17 at 01:38 +0100, Rafael J. Wysocki wrote: > > Hi, > > > > I thing the snippet below is a good summary of what this is about. > > Any progress on that? Well, I'm waiting for you to report back: http://patchwork.kernel.org/patch/74740/ The patch is appended once again for convenience. Rafael --- From: Rafael J. Wysocki Subject: MM / PM: Force GFP_NOIO during suspend/hibernation and resume There are quite a few GFP_KERNEL memory allocations made during suspend/hibernation and resume that may cause the system to hang, because the I/O operations they depend on cannot be completed due to the underlying devices being suspended. Avoid this problem by clearing the __GFP_IO and __GFP_FS bits in gfp_allowed_mask before suspend/hibernation and restoring the original values of these bits in gfp_allowed_mask durig the subsequent resume. Signed-off-by: Rafael J. Wysocki Reported-by: Maxim Levitsky --- kernel/power/hibernate.c | 6 ++++++ kernel/power/power.h | 3 +++ kernel/power/suspend.c | 2 ++ mm/Makefile | 1 + mm/pm.c | 28 ++++++++++++++++++++++++++++ 5 files changed, 40 insertions(+) Index: linux-2.6/kernel/power/hibernate.c =================================================================== --- linux-2.6.orig/kernel/power/hibernate.c +++ linux-2.6/kernel/power/hibernate.c @@ -334,6 +334,7 @@ int hibernation_snapshot(int platform_mo goto Close; suspend_console(); + mm_force_noio_allocations(); error = dpm_suspend_start(PMSG_FREEZE); if (error) goto Recover_platform; @@ -351,6 +352,7 @@ int hibernation_snapshot(int platform_mo dpm_resume_end(in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); + mm_allow_io_allocations(); resume_console(); Close: platform_end(platform_mode); @@ -448,11 +450,13 @@ int hibernation_restore(int platform_mod pm_prepare_console(); suspend_console(); + mm_force_noio_allocations(); error = dpm_suspend_start(PMSG_QUIESCE); if (!error) { error = resume_target_kernel(platform_mode); dpm_resume_end(PMSG_RECOVER); } + mm_allow_io_allocations(); resume_console(); pm_restore_console(); return error; @@ -481,6 +485,7 @@ int hibernation_platform_enter(void) entering_platform_hibernation = true; suspend_console(); + mm_force_noio_allocations(); error = dpm_suspend_start(PMSG_HIBERNATE); if (error) { if (hibernation_ops->recover) @@ -518,6 +523,7 @@ int hibernation_platform_enter(void) Resume_devices: entering_platform_hibernation = false; dpm_resume_end(PMSG_RESTORE); + mm_allow_io_allocations(); resume_console(); Close: Index: linux-2.6/kernel/power/power.h =================================================================== --- linux-2.6.orig/kernel/power/power.h +++ linux-2.6/kernel/power/power.h @@ -187,6 +187,9 @@ static inline void suspend_test_finish(c #ifdef CONFIG_PM_SLEEP /* kernel/power/main.c */ extern int pm_notifier_call_chain(unsigned long val); +/* mm/pm.c */ +extern void mm_force_noio_allocations(void); +extern void mm_allow_io_allocations(void); #endif #ifdef CONFIG_HIGHMEM Index: linux-2.6/kernel/power/suspend.c =================================================================== --- linux-2.6.orig/kernel/power/suspend.c +++ linux-2.6/kernel/power/suspend.c @@ -208,6 +208,7 @@ int suspend_devices_and_enter(suspend_st goto Close; } suspend_console(); + mm_force_noio_allocations(); suspend_test_start(); error = dpm_suspend_start(PMSG_SUSPEND); if (error) { @@ -224,6 +225,7 @@ int suspend_devices_and_enter(suspend_st suspend_test_start(); dpm_resume_end(PMSG_RESUME); suspend_test_finish("resume devices"); + mm_allow_io_allocations(); resume_console(); Close: if (suspend_ops->end) Index: linux-2.6/mm/Makefile =================================================================== --- linux-2.6.orig/mm/Makefile +++ linux-2.6/mm/Makefile @@ -40,3 +40,4 @@ obj-$(CONFIG_MEMORY_FAILURE) += memory-f obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o +obj-$(CONFIG_PM_SLEEP) += pm.o Index: linux-2.6/mm/pm.c =================================================================== --- /dev/null +++ linux-2.6/mm/pm.c @@ -0,0 +1,28 @@ +#include + +static gfp_t saved_gfp_allowed_mask; + +#define GFP_IOFS (__GFP_IO | __GFP_FS) + +/** + * mm_force_noio_allocations - Modify gfp_allowed_mask to disable IO allocations + * + * Change gfp_allowed_mask by unsetting __GFP_IO and __GFP_FS in it and save the + * old value. + */ +void mm_force_noio_allocations(void) +{ + saved_gfp_allowed_mask = gfp_allowed_mask; + gfp_allowed_mask &= ~GFP_IOFS; +} + +/** + * mm_allow_io_allocations - Modify gfp_allowed_mask to allow IO allocations + * + * If the saved value of gfp_allowed_mask has __GFP_IO set, modify the current + * gfp_allowed_mask by setting this bit and anlogously for __GFP_FS. + */ +void mm_allow_io_allocations(void) +{ + gfp_allowed_mask |= saved_gfp_allowed_mask & GFP_IOFS; +} -- 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/