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authorAndy Lutomirski <luto@kernel.org>2016-07-28 15:48:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-28 16:07:41 -0700
commitd30dd8be06a5ae640766b20ea9ae288832bd12ac (patch)
treec82789cc86b558aefa3a2eec522f0c63aadc457c /kernel/fork.c
parent11db04864336f20e19e16b64ade781eeefc3f6d3 (diff)
downloadlinux-linaro-stable-d30dd8be06a5ae640766b20ea9ae288832bd12ac.tar.gz
mm: track NR_KERNEL_STACK in KiB instead of number of stacks
Currently, NR_KERNEL_STACK tracks the number of kernel stacks in a zone. This only makes sense if each kernel stack exists entirely in one zone, and allowing vmapped stacks could break this assumption. Since frv has THREAD_SIZE < PAGE_SIZE, we need to track kernel stack allocations in a unit that divides both THREAD_SIZE and PAGE_SIZE on all architectures. Keep it simple and use KiB. Link: http://lkml.kernel.org/r/083c71e642c5fa5f1b6898902e1b2db7b48940d4.1468523549.git.luto@kernel.org Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index de21f25e0d2c..af3637e0ee52 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -225,7 +225,8 @@ static void account_kernel_stack(unsigned long *stack, int account)
{
struct zone *zone = page_zone(virt_to_page(stack));
- mod_zone_page_state(zone, NR_KERNEL_STACK, account);
+ mod_zone_page_state(zone, NR_KERNEL_STACK_KB,
+ THREAD_SIZE / 1024 * account);
}
void free_task(struct task_struct *tsk)