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author | 2011-03-08 13:19:51 +0100 | |
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committer | 2011-03-10 08:45:54 +0100 | |
commit | 73c101011926c5832e6e141682180c4debe2cf45 (patch) | |
tree | b8eeb521a7833cb198d6f39d5a931d820e2a663f /include/linux/blk_types.h | |
parent | scsi: convert to blk_delay_queue() (diff) | |
download | linux-73c101011926c5832e6e141682180c4debe2cf45.tar.gz linux-73c101011926c5832e6e141682180c4debe2cf45.tar.bz2 linux-73c101011926c5832e6e141682180c4debe2cf45.zip |
block: initial patch for on-stack per-task plugging
This patch adds support for creating a queuing context outside
of the queue itself. This enables us to batch up pieces of IO
before grabbing the block device queue lock and submitting them to
the IO scheduler.
The context is created on the stack of the process and assigned in
the task structure, so that we can auto-unplug it if we hit a schedule
event.
The current queue plugging happens implicitly if IO is submitted to
an empty device, yet callers have to remember to unplug that IO when
they are going to wait for it. This is an ugly API and has caused bugs
in the past. Additionally, it requires hacks in the vm (->sync_page()
callback) to handle that logic. By switching to an explicit plugging
scheme we make the API a lot nicer and can get rid of the ->sync_page()
hack in the vm.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/linux/blk_types.h')
-rw-r--r-- | include/linux/blk_types.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index dddedfc0af81..16b286473042 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -152,6 +152,7 @@ enum rq_flag_bits { __REQ_IO_STAT, /* account I/O stat */ __REQ_MIXED_MERGE, /* merge of different types, fail separately */ __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ + __REQ_ON_PLUG, /* on plug list */ __REQ_NR_BITS, /* stops here */ }; @@ -193,5 +194,6 @@ enum rq_flag_bits { #define REQ_IO_STAT (1 << __REQ_IO_STAT) #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) #define REQ_SECURE (1 << __REQ_SECURE) +#define REQ_ON_PLUG (1 << __REQ_ON_PLUG) #endif /* __LINUX_BLK_TYPES_H */ |