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gh-109587: Allow "precompiled" perf-trampolines to largely mitigate the cost of enabling perf-trampolines (#109666)

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gsallam 2023-10-26 20:57:29 -07:00 • committed by GitHub
parent 3d2f1f0b83
commit 21f068d80c
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8 changed files with 199 additions and 10 deletions
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41
Python/sysmodule.c
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@ -2361,7 +2361,7 @@ PyAPI_FUNC(int) PyUnstable_WritePerfMapEntry(
#ifndef MS_WINDOWS
if (perf_map_state.perf_map == NULL) {
int ret = PyUnstable_PerfMapState_Init();
if(ret != 0){
if (ret != 0){
return ret;
}
}
@ -2388,6 +2388,45 @@ PyAPI_FUNC(void) PyUnstable_PerfMapState_Fini(void) {
#endif
}
PyAPI_FUNC(int) PyUnstable_CopyPerfMapFile(const char* parent_filename) {
#ifndef MS_WINDOWS
FILE* from = fopen(parent_filename, "r");
if (!from) {
return -1;
}
if (perf_map_state.perf_map == NULL) {
int ret = PyUnstable_PerfMapState_Init();
if (ret != 0) {
return ret;
}
}
char buf[4096];
PyThread_acquire_lock(perf_map_state.map_lock, 1);
int fflush_result = 0, result = 0;
while (1) {
size_t bytes_read = fread(buf, 1, sizeof(buf), from);
size_t bytes_written = fwrite(buf, 1, bytes_read, perf_map_state.perf_map);
fflush_result = fflush(perf_map_state.perf_map);
if (fflush_result != 0 || bytes_read == 0 || bytes_written < bytes_read) {
result = -1;
goto close_and_release;
}
if (bytes_read < sizeof(buf) && feof(from)) {
goto close_and_release;
}
}
close_and_release:
fclose(from);
PyThread_release_lock(perf_map_state.map_lock);
return result;
#endif
return 0;
}
#ifdef __cplusplus
}
#endif
static PyMethodDef sys_methods[] = {
/* Might as well keep this in alphabetic order */