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author | Chang S. Bae <chang.seok.bae@intel.com> | 2021-12-10 14:55:03 -0800 |
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committer | Dave Hansen <dave.hansen@linux.intel.com> | 2021-12-14 13:08:36 -0800 |
commit | 6c3118c32129b4197999a8928ba776bcabd0f5c4 (patch) | |
tree | 839fa17c2527f3ce0ad401a9bb57ff0022e598af /kernel/signal.c | |
parent | cabdc3a8475b918e55744f43719b26a82dc8fa6b (diff) | |
download | linux-6c3118c32129b4197999a8928ba776bcabd0f5c4.tar.gz |
signal: Skip the altstack update when not needed
== Background == Support for large, "dynamic" fpstates was recently merged. This included code to ensure that sigaltstacks are sufficiently sized for these large states. A new lock was added to remove races between enabling large features and setting up sigaltstacks. == Problem == The new lock (sigaltstack_lock()) is acquired in the sigreturn path before restoring the old sigaltstack. Unfortunately, contention on the new lock causes a measurable signal handling performance regression [1]. However, the common case is that no *changes* are made to the sigaltstack state at sigreturn. == Solution == do_sigaltstack() acquires sigaltstack_lock() and is used for both sys_sigaltstack() and restoring the sigaltstack in sys_sigreturn(). Check for changes to the sigaltstack before taking the lock. If no changes were made, return before acquiring the lock. This removes lock contention from the common-case sigreturn path. [1] https://lore.kernel.org/lkml/20211207012128.GA16074@xsang-OptiPlex-9020/ Fixes: 3aac3ebea08f ("x86/signal: Implement sigaltstack size validation") Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20211210225503.12734-1-chang.seok.bae@intel.com
Diffstat (limited to 'kernel/signal.c')
-rw-r--r-- | kernel/signal.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index a629b11bf3e0..dfcee3888b00 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -4185,6 +4185,15 @@ do_sigaltstack (const stack_t *ss, stack_t *oss, unsigned long sp, ss_mode != 0)) return -EINVAL; + /* + * Return before taking any locks if no actual + * sigaltstack changes were requested. + */ + if (t->sas_ss_sp == (unsigned long)ss_sp && + t->sas_ss_size == ss_size && + t->sas_ss_flags == ss_flags) + return 0; + sigaltstack_lock(); if (ss_mode == SS_DISABLE) { ss_size = 0; |