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Allow vmem_alloc backed multilists

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Systems with a large number of CPU cores (192+) may trigger the large
allocation warning in multilist_create() on Linux.  Silence the warning
by converting the allocation to vmem_alloc().

On Linux this results in a call to kvalloc() which will alloc vmem
for large allocations and kmem for small allocations.

On FreeBSD both vmem_alloc and kmem_alloc internally use the same
allocator so there is no functional change.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17616
This commit is contained in:
Brian Behlendorf 2025-08-12 13:36:03 -07:00
parent 3e78905ffb
commit 0fe10361ba
1 changed files with 2 additions and 2 deletions
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4
module/zfs/multilist.c
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@ -81,7 +81,7 @@ multilist_create_impl(multilist_t *ml, size_t size, size_t offset,
ml->ml_num_sublists = num;
ml->ml_index_func = index_func;
ml->ml_sublists = kmem_zalloc(sizeof (multilist_sublist_t) *
ml->ml_sublists = vmem_zalloc(sizeof (multilist_sublist_t) *
ml->ml_num_sublists, KM_SLEEP);
ASSERT3P(ml->ml_sublists, !=, NULL);
@ -134,7 +134,7 @@ multilist_destroy(multilist_t *ml)
}
ASSERT3P(ml->ml_sublists, !=, NULL);
kmem_free(ml->ml_sublists,
vmem_free(ml->ml_sublists,
sizeof (multilist_sublist_t) * ml->ml_num_sublists);
ml->ml_num_sublists = 0;