diff options
| -rw-r--r-- | block/blk-mq-cpu.c | 5 | ||||
| -rw-r--r-- | block/blk-mq-cpumap.c | 5 | ||||
| -rw-r--r-- | block/blk-mq-tag.c | 12 | ||||
| -rw-r--r-- | block/blk-mq.c | 6 |
4 files changed, 28 insertions, 0 deletions
diff --git a/block/blk-mq-cpu.c b/block/blk-mq-cpu.c index d2c253f71b86..bb3ed488f7b5 100644 --- a/block/blk-mq-cpu.c +++ b/block/blk-mq-cpu.c @@ -1,3 +1,8 @@ +/* + * CPU notifier helper code for blk-mq + * + * Copyright (C) 2013-2014 Jens Axboe + */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c index 0daacb927be1..1065d7c65fa1 100644 --- a/block/blk-mq-cpumap.c +++ b/block/blk-mq-cpumap.c @@ -1,3 +1,8 @@ +/* + * CPU <-> hardware queue mapping helpers + * + * Copyright (C) 2013-2014 Jens Axboe + */ #include <linux/kernel.h> #include <linux/threads.h> #include <linux/module.h> diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 0d0640d38a06..d90c4aeb7dd3 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -1,3 +1,15 @@ +/* + * Fast and scalable bitmap tagging variant. Uses sparser bitmaps spread + * over multiple cachelines to avoid ping-pong between multiple submitters + * or submitter and completer. Uses rolling wakeups to avoid falling of + * the scaling cliff when we run out of tags and have to start putting + * submitters to sleep. + * + * Uses active queue tracking to support fairer distribution of tags + * between multiple submitters when a shared tag map is used. + * + * Copyright (C) 2013-2014 Jens Axboe + */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/random.h> diff --git a/block/blk-mq.c b/block/blk-mq.c index ae14749b530c..5cc4b871cb11 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1,3 +1,9 @@ +/* + * Block multiqueue core code + * + * Copyright (C) 2013-2014 Jens Axboe + * Copyright (C) 2013-2014 Christoph Hellwig + */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/backing-dev.h> |