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bcache: Rework allocator reserves

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We need a reserve for allocating buckets for new btree nodes - and now that
we've got multiple btrees, it really needs to be per btree.

This reworks the reserves so we've got separate freelists for each reserve
instead of watermarks, which seems to make things a bit cleaner, and it adds
some code so that btree_split() can make sure the reserve is available before it
starts.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-12-17 01:29:34 -08:00
parent 1dd13c8d3c
commit 78365411b3
8 changed files with 105 additions and 83 deletions
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8
include/trace/events/bcache.h
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@@ -411,7 +411,7 @@ TRACE_EVENT(bcache_alloc_invalidate,
),
TP_fast_assign(
__entry->free = fifo_used(&ca->free);
__entry->free = fifo_used(&ca->free[RESERVE_NONE]);
__entry->free_inc = fifo_used(&ca->free_inc);
__entry->free_inc_size = ca->free_inc.size;
__entry->unused = fifo_used(&ca->unused);
@@ -422,8 +422,8 @@ TRACE_EVENT(bcache_alloc_invalidate,
);
TRACE_EVENT(bcache_alloc_fail,
TP_PROTO(struct cache *ca),
TP_ARGS(ca),
TP_PROTO(struct cache *ca, unsigned reserve),
TP_ARGS(ca, reserve),
TP_STRUCT__entry(
__field(unsigned, free )
@@ -433,7 +433,7 @@ TRACE_EVENT(bcache_alloc_fail,
),
TP_fast_assign(
__entry->free = fifo_used(&ca->free);
__entry->free = fifo_used(&ca->free[reserve]);
__entry->free_inc = fifo_used(&ca->free_inc);
__entry->unused = fifo_used(&ca->unused);
__entry->blocked = atomic_read(&ca->set->prio_blocked);