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Add batching to arena bins.

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This adds a fast-path for threads freeing a small number of allocations to
bins which are not their "home-base" and which encounter lock contention in
attempting to do so. In producer-consumer workflows, such small lock hold times
can cause lock convoying that greatly increases overall bin mutex contention.
This commit is contained in:
David Goldblatt
2024-02-09 16:08:45 -08:00
committed by David Goldblatt
parent 44d91cf243
commit fc615739cb
16 changed files with 722 additions and 78 deletions
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35
test/unit/fork.c
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@@ -1,32 +1,5 @@
#include "test/jemalloc_test.h"
#ifndef _WIN32
#include <sys/wait.h>
#endif
#ifndef _WIN32
static void
wait_for_child_exit(int pid) {
int status;
while (true) {
if (waitpid(pid, &status, 0) == -1) {
test_fail("Unexpected waitpid() failure.");
}
if (WIFSIGNALED(status)) {
test_fail("Unexpected child termination due to "
"signal %d", WTERMSIG(status));
break;
}
if (WIFEXITED(status)) {
if (WEXITSTATUS(status) != 0) {
test_fail("Unexpected child exit value %d",
WEXITSTATUS(status));
}
break;
}
}
}
#endif
#include "test/fork.h"
TEST_BEGIN(test_fork) {
#ifndef _WIN32
@@ -64,7 +37,7 @@ TEST_BEGIN(test_fork) {
/* Child. */
_exit(0);
} else {
wait_for_child_exit(pid);
fork_wait_for_child_exit(pid);
}
#else
test_skip("fork(2) is irrelevant to Windows");
@@ -87,7 +60,7 @@ do_fork_thd(void *arg) {
test_fail("Exec failed");
} else {
/* Parent */
wait_for_child_exit(pid);
fork_wait_for_child_exit(pid);
}
return NULL;
}
@@ -124,7 +97,7 @@ TEST_BEGIN(test_fork_multithreaded) {
do_test_fork_multithreaded();
_exit(0);
} else {
wait_for_child_exit(pid);
fork_wait_for_child_exit(pid);
}
}
#else