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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-09-12 16:37:33 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-10-09 11:20:57 +0200 |
| commit | ce3dc447493ff4186b192b38d723ab5e8c1eb52f (patch) | |
| tree | f93f58afcd85087876a1ab9badcdaed76b5a37fe /arch/s390/kernel/asm-offsets.c | |
| parent | s390: add stack switch helper (diff) | |
| download | linux-ce3dc447493ff4186b192b38d723ab5e8c1eb52f.tar.xz linux-ce3dc447493ff4186b192b38d723ab5e8c1eb52f.zip | |
s390: add support for virtually mapped kernel stacks
With virtually mapped kernel stacks the kernel stack overflow detection
is now fault based, every stack has a guard page in the vmalloc space.
The panic_stack is renamed to nodat_stack and is used for all function
that need to run without DAT, e.g. memcpy_real or do_start_kdump.
The main effect is a reduction in the kernel image size as with vmap
stacks the old style overflow checking that adds two instructions per
function is not needed anymore. Result from bloat-o-meter:
add/remove: 20/1 grow/shrink: 13/26854 up/down: 2198/-216240 (-214042)
In regard to performance the micro-benchmark for fork has a hit of a
few microseconds, allocating 4 pages in vmalloc space is more expensive
compare to an order-2 page allocation. But with real workload I could
not find a noticeable difference.
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/asm-offsets.c')
| -rw-r--r-- | arch/s390/kernel/asm-offsets.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index 66e830f1c7bf..164bec175628 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -159,7 +159,7 @@ int main(void) OFFSET(__LC_CURRENT, lowcore, current_task); OFFSET(__LC_KERNEL_STACK, lowcore, kernel_stack); OFFSET(__LC_ASYNC_STACK, lowcore, async_stack); - OFFSET(__LC_PANIC_STACK, lowcore, panic_stack); + OFFSET(__LC_NODAT_STACK, lowcore, nodat_stack); OFFSET(__LC_RESTART_STACK, lowcore, restart_stack); OFFSET(__LC_RESTART_FN, lowcore, restart_fn); OFFSET(__LC_RESTART_DATA, lowcore, restart_data); |