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Benchmark signal delivery

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This commit is contained in:
Justine Tunney 2022-08-05 15:01:13 -07:00
parent 449fb2fb59
commit db8217b37b
2 changed files with 61 additions and 5 deletions
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56
test/libc/calls/signal_test.c
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@ -21,7 +21,9 @@
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
testonly void OnUsr1(int sig) {
@ -38,3 +40,57 @@ TEST(signal, test) {
ASSERT_NE(-1, raise(SIGUSR1));
__die();
}
////////////////////////////////////////////////////////////////////////////////
// signal round-trip delivery takes about 1µs
void OnSigTrap(int sig, struct siginfo *si, struct ucontext *ctx) {
}
void TrapBench(int n) {
for (int i = 0; i < n; ++i) {
asm("int3");
}
}
BENCH(signal, trapBench) {
struct sigaction old;
struct sigaction sabus = {.sa_sigaction = OnSigTrap};
ASSERT_SYS(0, 0, sigaction(SIGTRAP, &sabus, &old));
EZBENCH_N("signal trap", 16, TrapBench(16));
EZBENCH_N("signal trap", 256, TrapBench(256));
EZBENCH_N("signal trap", 1024, TrapBench(1024));
sigaction(SIGTRAP, &old, 0);
}
BENCH(signal, trapBenchSiginfo) {
struct sigaction old;
struct sigaction sabus = {.sa_sigaction = OnSigTrap, .sa_flags = SA_SIGINFO};
ASSERT_SYS(0, 0, sigaction(SIGTRAP, &sabus, &old));
EZBENCH_N("siginfo trap", 16, TrapBench(16));
EZBENCH_N("siginfo trap", 256, TrapBench(256));
EZBENCH_N("siginfo trap", 1024, TrapBench(1024));
sigaction(SIGTRAP, &old, 0);
}
void OnSigHlt(int sig, struct siginfo *si, struct ucontext *ctx) {
ctx->uc_mcontext.rip += 1;
}
void HltBench(int n) {
for (int i = 0; i < n; ++i) {
asm("hlt");
}
}
BENCH(signal, hltBenchSiginfo) {
struct sigaction old[2];
struct sigaction sabus = {.sa_sigaction = OnSigHlt, .sa_flags = SA_SIGINFO};
ASSERT_SYS(0, 0, sigaction(SIGSEGV, &sabus, old + 0));
ASSERT_SYS(0, 0, sigaction(SIGBUS, &sabus, old + 1));
EZBENCH_N("siginfo hlt", 16, HltBench(16));
EZBENCH_N("siginfo hlt", 256, HltBench(256));
EZBENCH_N("siginfo hlt", 1024, HltBench(1024));
sigaction(SIGSEGV, old + 0, 0);
sigaction(SIGBUS, old + 1, 0);
}