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Optimize arc_l2c_only lists assertions. #12421

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Aug 17, 2021
+12 −9
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Optimize arc_l2c_only lists assertions. #12421

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21 changes: 12 additions & 9 deletions module/zfs/arc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2578,13 +2578,6 @@ arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
l2arc_hdr_arcstats_increment_state(hdr);
}
}

/*
* L2 headers should never be on the L2 state list since they don't
* have L1 headers allocated.
*/
ASSERT(multilist_is_empty(&arc_l2c_only->arcs_list[ARC_BUFC_DATA]) &&
multilist_is_empty(&arc_l2c_only->arcs_list[ARC_BUFC_METADATA]));
}

void
Expand Down Expand Up @@ -7465,6 +7458,12 @@ arc_state_multilist_index_func(multilist_t *ml, void *obj)
multilist_get_num_sublists(ml));
}

static unsigned int
arc_state_l2c_multilist_index_func(multilist_t *ml, void *obj)
{
panic("Header %p insert into arc_l2c_only %p", obj, ml);
}

#define WARN_IF_TUNING_IGNORED(tuning, value, do_warn) do { \
if ((do_warn) && (tuning) && ((tuning) != (value))) { \
cmn_err(CE_WARN, \
Expand Down Expand Up @@ -7612,14 +7611,18 @@ arc_state_init(void)
sizeof (arc_buf_hdr_t),
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
arc_state_multilist_index_func);
/*
* L2 headers should never be on the L2 state list since they don't
* have L1 headers allocated. Special index function asserts that.
*/
multilist_create(&arc_l2c_only->arcs_list[ARC_BUFC_METADATA],
sizeof (arc_buf_hdr_t),
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
arc_state_multilist_index_func);
arc_state_l2c_multilist_index_func);
multilist_create(&arc_l2c_only->arcs_list[ARC_BUFC_DATA],
sizeof (arc_buf_hdr_t),
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
arc_state_multilist_index_func);
arc_state_l2c_multilist_index_func);

zfs_refcount_create(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
zfs_refcount_create(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
Expand Down