From ff39593ad0ff7a79a3717edac6634407aa8200c2 Mon Sep 17 00:00:00 2001 From: Nigel Cunningham Date: Wed, 6 Dec 2006 20:34:28 -0800 Subject: [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 Cc: Pavel Machek Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/process.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) (limited to 'kernel') 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(); -- cgit v1.2.3