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4140e2b31b
The prctl.h ABI header was slightly updated during the development of the interface. In particular the "immutable" parameter became a bit in the option argument. Synchronize prctl.h ABI header again and make use of the definition in the testsuite and "perf bench futex". Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: André Almeida <andrealmeid@igalia.com> Link: https://lore.kernel.org/r/20250517151455.1065363-5-bigeasy@linutronix.de
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/prctl.h>
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#include <sys/prctl.h>
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#include "futex.h"
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void futex_set_nbuckets_param(struct bench_futex_parameters *params)
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{
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unsigned long flags;
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int ret;
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if (params->nbuckets < 0)
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return;
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flags = params->buckets_immutable ? FH_FLAG_IMMUTABLE : 0;
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ret = prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS, params->nbuckets, flags);
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if (ret) {
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printf("Requesting %d hash buckets failed: %d/%m\n",
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params->nbuckets, ret);
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err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)");
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}
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}
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void futex_print_nbuckets(struct bench_futex_parameters *params)
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{
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char *futex_hash_mode;
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int ret;
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ret = prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_GET_SLOTS);
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if (params->nbuckets >= 0) {
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if (ret != params->nbuckets) {
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if (ret < 0) {
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printf("Can't query number of buckets: %m\n");
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err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)");
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}
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printf("Requested number of hash buckets does not currently used.\n");
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printf("Requested: %d in usage: %d\n", params->nbuckets, ret);
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err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)");
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}
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if (params->nbuckets == 0) {
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ret = asprintf(&futex_hash_mode, "Futex hashing: global hash");
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} else {
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ret = prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_GET_IMMUTABLE);
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if (ret < 0) {
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printf("Can't check if the hash is immutable: %m\n");
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err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)");
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}
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ret = asprintf(&futex_hash_mode, "Futex hashing: %d hash buckets %s",
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params->nbuckets,
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ret == 1 ? "(immutable)" : "");
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}
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} else {
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if (ret <= 0) {
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ret = asprintf(&futex_hash_mode, "Futex hashing: global hash");
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} else {
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ret = asprintf(&futex_hash_mode, "Futex hashing: auto resized to %d buckets",
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ret);
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}
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}
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if (ret < 0)
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err(EXIT_FAILURE, "ENOMEM, futex_hash_mode");
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printf("%s\n", futex_hash_mode);
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free(futex_hash_mode);
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}
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