• Shaohua Li's avatar
    percpu_ida: add an API to return free tags · 1dddc01a
    Shaohua Li authored
    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: default avatarShaohua Li <shli@fusionio.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    1dddc01a
percpu_ida.c 9.61 KB