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authorShaohua Li <shli@kernel.org>2013-10-15 09:05:03 +0800
committerJens Axboe <axboe@kernel.dk>2013-10-25 11:56:00 +0100
commit1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0 (patch)
treec2812f72384ee2f4e0d90f65844bdd91a370e8c5
parent7fc2ba17e8bf9f218cac10cc2a3de613d9d9086d (diff)
percpu_ida: add an API to return free tags
Add an API to return free tags, blk-mq-tag will use it. Note, this just returns a snapshot of free tags number. blk-mq-tag has two usages of it. One is for info output for diagnosis. The other is to quickly check if there are free tags for request dispatch checking. Neither requires very precise. Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--include/linux/percpu_ida.h1
-rw-r--r--lib/percpu_ida.c17
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/percpu_ida.h b/include/linux/percpu_ida.h
index 63510ae6f933..1900bd0fa639 100644
--- a/include/linux/percpu_ida.h
+++ b/include/linux/percpu_ida.h
@@ -77,4 +77,5 @@ typedef int (*percpu_ida_cb)(unsigned, void *);
int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn,
void *data);
+unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu);
#endif /* __PERCPU_IDA_H__ */
diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c
index 0f51c1b556cf..b0698ea972c6 100644
--- a/lib/percpu_ida.c
+++ b/lib/percpu_ida.c
@@ -371,3 +371,20 @@ out:
return err;
}
EXPORT_SYMBOL_GPL(percpu_ida_for_each_free);
+
+/**
+ * percpu_ida_free_tags - return free tags number of a specific cpu or global pool
+ * @pool: pool related
+ * @cpu: specific cpu or global pool if @cpu == nr_cpu_ids
+ *
+ * Note: this just returns a snapshot of free tags number.
+ */
+unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu)
+{
+ struct percpu_ida_cpu *remote;
+ if (cpu == nr_cpu_ids)
+ return pool->nr_free;
+ remote = per_cpu_ptr(pool->tag_cpu, cpu);
+ return remote->nr_free;
+}
+EXPORT_SYMBOL_GPL(percpu_ida_free_tags);