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fix performance regression

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Thomas Schoebel-Theuer 2011-12-08 16:38:04 +01:00 committed by Thomas Schoebel-Theuer
parent 409536c010
commit 9257e02b81
2 changed files with 21 additions and 14 deletions
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33
mars_if.c
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@ -9,20 +9,21 @@
//#define IO_DEBUGGING
#define REQUEST_MERGING
//#define ALWAYS_UNPLUG false
#define ALWAYS_UNPLUG true
#define ALWAYS_UNPLUG false
#define ALWAYS_UNPLUG_FROM_EXTERNAL true
#define PREFETCH_LEN PAGE_SIZE
//#define FRONT_MERGE // FIXME: this does not work.
//#define MODIFY_READAHEAD // don't use it, otherwise sequential IO will suffer
// low-level device parameters
//#define USE_MAX_SECTORS (MARS_MAX_SEGMENT_SIZE >> 9)
//#define USE_MAX_PHYS_SEGMENTS (MARS_MAX_SEGMENT_SIZE >> 9)
//#define USE_MAX_SEGMENT_SIZE MARS_MAX_SEGMENT_SIZE
//#define USE_LOGICAL_BLOCK_SIZE 512
//#define USE_SEGMENT_BOUNDARY (PAGE_SIZE-1)
//#define USE_QUEUE_ORDERED QUEUE_ORDERED_DRAIN
#define USE_MAX_SECTORS (MARS_MAX_SEGMENT_SIZE >> 9)
#define USE_MAX_PHYS_SEGMENTS (MARS_MAX_SEGMENT_SIZE >> 9)
#define USE_MAX_SEGMENT_SIZE MARS_MAX_SEGMENT_SIZE
#define USE_LOGICAL_BLOCK_SIZE 512
#define USE_SEGMENT_BOUNDARY (PAGE_SIZE-1)
#define USE_QUEUE_ORDERED QUEUE_ORDERED_DRAIN // probably not needed, but safer for production systems
//#define USE_CONGESTED_FN
#define USE_CONGESTED_FN
#define USE_MERGE_BVEC
//#define DENY_READA
@ -148,6 +149,8 @@ void _if_unplug(struct if_input *input)
might_sleep();
#endif
MARS_IO("plugged_count = %d\n", atomic_read(&input->plugged_count));
down(&input->kick_sem);
traced_lock(&input->req_lock, flags);
#ifdef USE_TIMER
@ -208,6 +211,7 @@ void _if_unplug(struct if_input *input)
static
void if_timer(unsigned long data)
{
MARS_IO("\n");
_if_unplug((void*)data);
}
#endif
@ -504,7 +508,7 @@ err:
}
input->timer.function = if_timer;
input->timer.data = (unsigned long)input;
input->timer.expires = jiffies + HZ/10;
input->timer.expires = jiffies + USE_TIMER;
add_timer(&input->timer);
traced_unlock(&input->req_lock, flags);
}
@ -516,6 +520,7 @@ err:
//static
void if_unplug(struct request_queue *q)
{
struct if_input *input = q->queuedata;
int was_plugged = 1;
#if 1
spin_lock_irq(q->queue_lock);
@ -524,9 +529,11 @@ void if_unplug(struct request_queue *q)
#else
queue_flag_clear_unlocked(QUEUE_FLAG_PLUGGED, q);
#endif
was_plugged += atomic_read(&input->plugged_count);
MARS_IO("block layer called UNPLUG was_plugged = %d\n", was_plugged);
if (true || was_plugged) {
struct if_input *input = q->queuedata;
if (ALWAYS_UNPLUG_FROM_EXTERNAL || was_plugged) {
_if_unplug(input);
}
}
@ -632,7 +639,7 @@ static int if_switch(struct if_brick *brick)
/* we have no partitions. we contain only ourselves. */
input->bdev->bd_contains = input->bdev;
#if 1
#ifdef MODIFY_READAHEAD
MARS_INF("ra_pages OLD = %lu NEW = %d\n", q->backing_dev_info.ra_pages, brick->readahead);
q->backing_dev_info.ra_pages = brick->readahead;
#endif

2
mars_if.h
View File

@ -12,7 +12,7 @@
#define IF_HASH_MAX 2048
#define IF_HASH_CHUNK (PAGE_SIZE * 32)
//#define USE_TIMER
//#define USE_TIMER (HZ/10) // use this ONLY for debugging
/* I don't want to enhance / intrude into struct bio for compatibility reasons
* (support for a variety of kernel versions).