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| author | Heiko Carstens <hca@linux.ibm.com> | 2023-04-05 16:08:41 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2023-04-20 12:36:35 +0300 |
| commit | 2a405f6bb3a5b2baaa74dfc5aaa0e1b99145bd1b (patch) | |
| tree | 6481ca657215160fa0914083d4c81ce40caf854d /tools/testing/cxl/test/mem.c | |
| parent | 491a78663e039fabc58c892ca8f2c2e08caaf4f8 (diff) | |
| download | linux-2a405f6bb3a5b2baaa74dfc5aaa0e1b99145bd1b.tar.xz | |
s390/stackleak: provide fast __stackleak_poison() implementation
Provide an s390 specific __stackleak_poison() implementation which is
faster than the generic variant.
For the original implementation with an enforced 4kb stackframe for the
getpid() system call the system call overhead increases by a factor of 3 if
the stackleak feature is enabled. Using the s390 mvc based variant this is
reduced to an increase of 25% instead.
This is within the expected area, since the mvc based implementation is
more or less a memset64() variant which comes with similar results. See
commit 0b77d6701cf8 ("s390: implement memset16, memset32 & memset64").
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20230405130841.1350565-3-hca@linux.ibm.com
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'tools/testing/cxl/test/mem.c')
0 files changed, 0 insertions, 0 deletions