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example/nvmf: Create only a single SPDK thread on the master core at startup

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Stop creating the default lightweight thread per POSIX thread. Additionally,
substitute the created master thread into g_init_thread directly as a
preparation to the next patch.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I09643491e6b5aaf91d9958481f05e264a2ac5f7d
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2542
Community-CI: Mellanox Build Bot
Community-CI: Broadcom CI
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
This commit is contained in:
Shuhei Matsumoto 2020-05-20 07:48:40 +09:00 committed by Tomasz Zawadzki
parent f7ebaeaa59
commit 10190302d2
1 changed files with 8 additions and 18 deletions
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26
examples/nvmf/nvmf/nvmf.c
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@ -309,7 +309,6 @@ nvmf_init_threads(void)
uint32_t i;
char thread_name[32];
struct nvmf_reactor *nvmf_reactor;
struct spdk_thread *thread;
struct spdk_cpuset cpumask;
uint32_t master_core = spdk_env_get_current_core();
@ -357,20 +356,14 @@ nvmf_init_threads(void)
}
}
/* Some SPDK libraries assume that there is at least some number of lightweight
* threads that exist from the beginning of time. That assumption is currently
* being removed from the SPDK libraries, but until that work is completed spawn
* one lightweight thread per reactor here.
*/
SPDK_ENV_FOREACH_CORE(i) {
spdk_cpuset_zero(&cpumask);
spdk_cpuset_set_cpu(&cpumask, i, true);
snprintf(thread_name, sizeof(thread_name), "spdk_thread_%u", i);
thread = spdk_thread_create(thread_name, &cpumask);
if (!thread) {
fprintf(stderr, "failed to create spdk thread\n");
return -1;
}
/* Spawn a lightweight thread only on the current core to manage this application. */
spdk_cpuset_zero(&cpumask);
spdk_cpuset_set_cpu(&cpumask, master_core, true);
snprintf(thread_name, sizeof(thread_name), "nvmf_master_thread");
g_init_thread = spdk_thread_create(thread_name, &cpumask);
if (!g_init_thread) {
fprintf(stderr, "failed to create spdk thread\n");
return -1;
}
fprintf(stdout, "nvmf threads initlize successfully\n");
@ -896,7 +889,6 @@ int main(int argc, char **argv)
{
int rc;
struct spdk_env_opts opts;
struct nvmf_lw_thread *lw_thread;
spdk_env_opts_init(&opts);
opts.name = "nvmf-example";
@ -919,8 +911,6 @@ int main(int argc, char **argv)
* that continues initialization. This is how we bootstrap the
* program so that all code from here on is running on an SPDK thread.
*/
lw_thread = TAILQ_FIRST(&g_master_reactor->threads);
g_init_thread = spdk_thread_get_from_ctx(lw_thread);
assert(g_init_thread != NULL);
rc = nvmf_setup_signal_handlers();