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Use boot_ncpus in place of max_ncpus in taskq_create

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Due to hotplug support or BIOS bugs sometimes max_ncpus can be
an absurdly high value. I have a system with 32 cores/threads
but reports max_ncpus == 440. This many threads potentially
cripples the system during arc_prune floods for example.

boot_ncpus is the number of working CPUs when called so use
that instead.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: DHE <git@dehacked.net>
Closes #10282
This commit is contained in:
DeHackEd
2020-05-20 13:07:21 -04:00
committed by GitHub
parent de4f06c275
commit 57434abae6
3 changed files with 6 additions and 6 deletions
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module/zfs/dsl_pool.c
+3 -3
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@@ -220,10 +220,10 @@ dsl_pool_open_impl(spa_t *spa, uint64_t txg)
mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL);
cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL);
dp->dp_zrele_taskq = taskq_create("z_zrele", max_ncpus, defclsyspri,
max_ncpus * 8, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
dp->dp_zrele_taskq = taskq_create("z_zrele", boot_ncpus, defclsyspri,
boot_ncpus * 8, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
dp->dp_unlinked_drain_taskq = taskq_create("z_unlinked_drain",
max_ncpus, defclsyspri, max_ncpus, INT_MAX,
boot_ncpus, defclsyspri, boot_ncpus, INT_MAX,
TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
return (dp);