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[BLOCK] mark some block/ variables cons

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the patch below marks various read-only variables in block/* as const,
so that gcc can optimize the use of them; eg gcc will replace the use by
the value directly now and will even remove the memory usage of these.

Signed-off-by: Arjan van de Ven <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Arjan van de Ven 2006-01-06 09:46:02 +01:00 • committed by Jens Axboe
commit 64100099ed
4 changed files with 14 additions and 14 deletions
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8
block/deadline-iosched.c
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@ -19,10 +19,10 @@
/*
* See Documentation/block/deadline-iosched.txt
*/
static int read_expire = HZ / 2; /* max time before a read is submitted. */
static int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */
static int writes_starved = 2; /* max times reads can starve a write */
static int fifo_batch = 16; /* # of sequential requests treated as one
static const int read_expire = HZ / 2; /* max time before a read is submitted. */
static const int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */
static const int writes_starved = 2; /* max times reads can starve a write */
static const int fifo_batch = 16; /* # of sequential requests treated as one
by the above parameters. For throughput. */
static const int deadline_hash_shift = 5;