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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-10-25 12:21:44 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-11-11 16:37:40 +0100
commitc360192bf4a8dc72f102dd6a4e1bf8bd0b404cfa (patch)
treec54104bae43978dfe31e6fc2c9a4d996218379fd /arch/s390/mm/fault.c
parent1993dbc7e09a7ffdd98975589aa83387928e9fe7 (diff)
downloadlinux-c360192bf4a8dc72f102dd6a4e1bf8bd0b404cfa.tar.bz2
s390/preempt: move preempt_count to the lowcore
Convert s390 to use a field in the struct lowcore for the CPU preemption count. It is a bit cheaper to access a lowcore field compared to a thread_info variable and it removes the depencency on a task related structure. bloat-o-meter on the vmlinux image for the default configuration (CONFIG_PREEMPT_NONE=y) reports a small reduction in text size: add/remove: 0/0 grow/shrink: 18/578 up/down: 228/-5448 (-5220) A larger improvement is achieved with the default configuration but with CONFIG_PREEMPT=y and CONFIG_DEBUG_PREEMPT=n: add/remove: 2/6 grow/shrink: 59/4477 up/down: 1618/-228762 (-227144) Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/fault.c')
-rw-r--r--arch/s390/mm/fault.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 661d9fe63c43..d1faae5cdd12 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -733,6 +733,7 @@ block:
* return to userspace schedule() to block. */
__set_current_state(TASK_UNINTERRUPTIBLE);
set_tsk_need_resched(tsk);
+ set_preempt_need_resched();
}
}
out: