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[PATCH] swsusp: thaw userspace and kernel space separately

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Modify process thawing so that we can thaw kernel space without thawing
userspace, and thaw kernelspace first.  This will be useful in later
patches, where I intend to get swsusp thawing kernel threads only before
seeking to free memory.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nigel Cunningham 2006-12-06 20:34:28 -08:00 committed by Linus Torvalds
parent 14b5b7cfaa
commit ff39593ad0
2 changed files with 26 additions and 8 deletions
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9
include/linux/freezer.h
View file

@ -1,5 +1,8 @@
/* Freezer declarations */
#define FREEZER_KERNEL_THREADS 0
#define FREEZER_ALL_THREADS 1
#ifdef CONFIG_PM
/*
* Check if a process has been frozen
@ -57,7 +60,8 @@ static inline void frozen_process(struct task_struct *p)
extern void refrigerator(void);
extern int freeze_processes(void);
extern void thaw_processes(void);
#define thaw_processes() do { thaw_some_processes(FREEZER_ALL_THREADS); } while(0)
#define thaw_kernel_threads() do { thaw_some_processes(FREEZER_KERNEL_THREADS); } while(0)
static inline int try_to_freeze(void)
{
@ -67,6 +71,9 @@ static inline int try_to_freeze(void)
} else
return 0;
}
extern void thaw_some_processes(int all);
#else
static inline int frozen(struct task_struct *p) { return 0; }
static inline int freezing(struct task_struct *p) { return 0; }

25
kernel/power/process.c
View file

@ -153,18 +153,29 @@ int freeze_processes(void)
return 0;
}
void thaw_processes(void)
void thaw_some_processes(int all)
{
struct task_struct *g, *p;
int pass = 0; /* Pass 0 = Kernel space, 1 = Userspace */
printk("Restarting tasks... ");
read_lock(&tasklist_lock);
do_each_thread(g, p) {
if (!freezeable(p))
continue;
if (!thaw_process(p))
printk(KERN_INFO "Strange, %s not stopped\n", p->comm);
} while_each_thread(g, p);
do {
do_each_thread(g, p) {
/*
* is_user = 0 if kernel thread or borrowed mm,
* 1 otherwise.
*/
int is_user = !!(p->mm && !(p->flags & PF_BORROWED_MM));
if (!freezeable(p) || (is_user != pass))
continue;
if (!thaw_process(p))
printk(KERN_INFO
"Strange, %s not stopped\n", p->comm);
} while_each_thread(g, p);
pass++;
} while (pass < 2 && all);
read_unlock(&tasklist_lock);
schedule();