| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <200707041658.59588.rjw@sisk.pl>
Date: Wed, 4 Jul 2007 16:58:58 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: pm list <linux-pm@...ts.linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
LKML <linux-kernel@...r.kernel.org>,
Matthew Garrett <mjg59@...f.ucam.org>,
Nigel Cunningham <nigel@...el.suspend2.net>,
Oliver Neukum <oliver@...kum.org>, Pavel Machek <pavel@....cz>,
Paul Mackerras <paulus@...ba.org>,
Miklos Szeredi <miklos@...redi.hu>, Ingo Molnar <mingo@...e.hu>
Subject: [RFC][PATCH -mm] PM: Do not sync from within the freezer during suspend to RAM
From: Rafael J. Wysocki <rjw@...k.pl>
The syncing of filesystems from within the freezer in not needed for suspend to
RAM. Change freeze_processes() so that it doesn't execute sys_sync() and
introduce the "syncing" version of it to be called from the hibernation code
paths.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
include/linux/freezer.h | 14 ++++++++++++--
kernel/power/disk.c | 2 +-
kernel/power/main.c | 6 ++++++
kernel/power/process.c | 8 +++++---
kernel/power/user.c | 2 +-
5 files changed, 25 insertions(+), 7 deletions(-)
Index: linux-2.6.22-rc7/include/linux/freezer.h
===================================================================
--- linux-2.6.22-rc7.orig/include/linux/freezer.h 2007-07-04 00:21:26.000000000 +0200
+++ linux-2.6.22-rc7/include/linux/freezer.h 2007-07-04 00:22:37.000000000 +0200
@@ -62,7 +62,7 @@ static inline int thaw_process(struct ta
}
extern void refrigerator(void);
-extern int freeze_processes(void);
+extern int __freeze_processes(int sync_filesystems);
extern void thaw_processes(void);
static inline int try_to_freeze(void)
@@ -134,7 +134,7 @@ static inline void clear_freeze_flag(str
static inline int thaw_process(struct task_struct *p) { return 1; }
static inline void refrigerator(void) {}
-static inline int freeze_processes(void) { BUG(); return 0; }
+static inline int __freeze_processes(int s) { BUG(); return 0; }
static inline void thaw_processes(void) {}
static inline int try_to_freeze(void) { return 0; }
@@ -145,4 +145,14 @@ static inline int freezer_should_skip(st
static inline void set_freezable(void) {}
#endif
+static inline int freeze_processes(void)
+{
+ return __freeze_processes(0);
+}
+
+static inline int freeze_processes_with_sync(void)
+{
+ return __freeze_processes(1);
+}
+
#endif /* FREEZER_H_INCLUDED */
Index: linux-2.6.22-rc7/kernel/power/disk.c
===================================================================
--- linux-2.6.22-rc7.orig/kernel/power/disk.c 2007-07-04 00:21:26.000000000 +0200
+++ linux-2.6.22-rc7/kernel/power/disk.c 2007-07-04 00:21:44.000000000 +0200
@@ -281,7 +281,7 @@ static int prepare_processes(void)
int error = 0;
pm_prepare_console();
- if (freeze_processes()) {
+ if (freeze_processes_with_sync()) {
error = -EBUSY;
unprepare_processes();
}
Index: linux-2.6.22-rc7/kernel/power/main.c
===================================================================
--- linux-2.6.22-rc7.orig/kernel/power/main.c 2007-07-04 00:21:26.000000000 +0200
+++ linux-2.6.22-rc7/kernel/power/main.c 2007-07-04 00:23:40.000000000 +0200
@@ -20,6 +20,7 @@
#include <linux/resume-trace.h>
#include <linux/freezer.h>
#include <linux/vmstat.h>
+#include <linux/syscalls.h>
#include "power.h"
@@ -231,6 +232,11 @@ static int enter_state(suspend_state_t s
if (!valid_state(state))
return -ENODEV;
+
+ printk("Syncing filesystems ... ");
+ sys_sync();
+ printk("done.\n");
+
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
Index: linux-2.6.22-rc7/kernel/power/process.c
===================================================================
--- linux-2.6.22-rc7.orig/kernel/power/process.c 2007-07-04 00:21:26.000000000 +0200
+++ linux-2.6.22-rc7/kernel/power/process.c 2007-07-04 00:21:44.000000000 +0200
@@ -179,9 +179,9 @@ static int try_to_freeze_tasks(int freez
}
/**
- * freeze_processes - tell processes to enter the refrigerator
+ * __freeze_processes - tell processes to enter the refrigerator
*/
-int freeze_processes(void)
+int __freeze_processes(int sync_filesystems)
{
int error;
@@ -190,7 +190,9 @@ int freeze_processes(void)
if (error)
return error;
- sys_sync();
+ if (sync_filesystems)
+ sys_sync();
+
error = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
if (error)
return error;
Index: linux-2.6.22-rc7/kernel/power/user.c
===================================================================
--- linux-2.6.22-rc7.orig/kernel/power/user.c 2007-07-04 00:21:26.000000000 +0200
+++ linux-2.6.22-rc7/kernel/power/user.c 2007-07-04 00:21:44.000000000 +0200
@@ -153,7 +153,7 @@ static int snapshot_ioctl(struct inode *
mutex_lock(&pm_mutex);
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (!error) {
- error = freeze_processes();
+ error = freeze_processes_with_sync();
if (error)
thaw_processes();
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists