diff options
| author | Ingo Molnar <mingo@elte.hu> | 2004-09-13 17:48:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-09-13 17:48:14 -0700 |
| commit | 3ed45fdf44b17165294cef855cd5961108b68f04 (patch) | |
| tree | 832ea4a1524a9474a59bd88d9256b8c05ea10862 /include/linux/blkdev.h | |
| parent | 90d4cd4f856b2ed48fc667e1c46fc9da3bc97a2f (diff) | |
[PATCH] blk: max_sectors tunables
Introduces two new /sys/block values:
/sys/block/*/queue/max_hw_sectors_kb
/sys/block/*/queue/max_sectors_kb
max_hw_sectors_kb is the maximum that the driver can handle and is
readonly. max_sectors_kb is the current max_sectors value and can be tuned
by root. PAGE_SIZE granularity is enforced.
It's all locking-safe and all affected layered drivers have been updated as
well. The patch has been in testing for a couple of weeks already as part
of the voluntary-preempt patches and it works just fine - people use it to
reduce IDE IRQ handling latencies.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 305dcb9311d9..4efe45d1af7e 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -344,6 +344,7 @@ struct request_queue unsigned int nr_congestion_off; unsigned short max_sectors; + unsigned short max_hw_sectors; unsigned short max_phys_segments; unsigned short max_hw_segments; unsigned short hardsect_size; |