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authorNigel Cunningham <ncunningham@linuxmail.org>2006-12-06 20:34:28 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:28 -0800
commitff39593ad0ff7a79a3717edac6634407aa8200c2 (patch)
tree571e02e20d5d211224567d5cc22333196cf6f563 /kernel/power/process.c
parent14b5b7cfaa110b1d25b8f80b01a8c97cf2db30bc (diff)
[PATCH] swsusp: thaw userspace and kernel space separately
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>
Diffstat (limited to 'kernel/power/process.c')
-rw-r--r--kernel/power/process.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c
index fedabad5a180..cba8a5890eda 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -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();