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bcache: Fix/revamp tracepoints

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The tracepoints were reworked to be more sensible, and fixed a null
pointer deref in one of the tracepoints.

Converted some of the pr_debug()s to tracepoints - this is partly a
performance optimization; it used to be that with DEBUG or
CONFIG_DYNAMIC_DEBUG pr_debug() was an empty macro; but at some point it
was changed to an empty inline function.

Some of the pr_debug() statements had rather expensive function calls as
part of the arguments, so this code was getting run unnecessarily even
on non debug kernels - in some fast paths, too.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
This commit is contained in:
Kent Overstreet
2013-04-26 15:39:55 -07:00
parent 5794351146
commit c37511b863
15 changed files with 413 additions and 267 deletions
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10
drivers/md/bcache/alloc.c
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@@ -65,6 +65,7 @@
#include <linux/kthread.h>
#include <linux/random.h>
#include <trace/events/bcache.h>
#define MAX_IN_FLIGHT_DISCARDS 8U
@@ -351,10 +352,7 @@ static void invalidate_buckets(struct cache *ca)
break;
}
pr_debug("free %zu/%zu free_inc %zu/%zu unused %zu/%zu",
fifo_used(&ca->free), ca->free.size,
fifo_used(&ca->free_inc), ca->free_inc.size,
fifo_used(&ca->unused), ca->unused.size);
trace_bcache_alloc_invalidate(ca);
}
#define allocator_wait(ca, cond) \
@@ -473,9 +471,7 @@ again:
return r;
}
pr_debug("alloc failure: blocked %i free %zu free_inc %zu unused %zu",
atomic_read(&ca->set->prio_blocked), fifo_used(&ca->free),
fifo_used(&ca->free_inc), fifo_used(&ca->unused));
trace_bcache_alloc_fail(ca);
if (cl) {
closure_wait(&ca->set->bucket_wait, cl);