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[BLOCK] Unify the seperate read/write io stat fields into arrays

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Instead of having ->read_sectors and ->write_sectors, combine the two
into ->sectors[2] and similar for the other fields. This saves a branch
several places in the io path, since we don't have to care for what the
actual io direction is. On my x86-64 box, that's 200 bytes less text in
just the core (not counting the various drivers).

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2005-11-01 09:26:16 +01:00
commit a362357b6c
12 changed files with 61 additions and 105 deletions
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7
fs/partitions/check.c
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@ -246,8 +246,8 @@ static ssize_t part_size_read(struct hd_struct * p, char *page)
static ssize_t part_stat_read(struct hd_struct * p, char *page)
{
return sprintf(page, "%8u %8llu %8u %8llu\n",
p->reads, (unsigned long long)p->read_sectors,
p->writes, (unsigned long long)p->write_sectors);
p->ios[0], (unsigned long long)p->sectors[0],
p->ios[1], (unsigned long long)p->sectors[1]);
}
static struct part_attribute part_attr_uevent = {
.attr = {.name = "uevent", .mode = S_IWUSR },
@ -303,7 +303,8 @@ void delete_partition(struct gendisk *disk, int part)
disk->part[part-1] = NULL;
p->start_sect = 0;
p->nr_sects = 0;
p->reads = p->writes = p->read_sectors = p->write_sectors = 0;
p->ios[0] = p->ios[1] = 0;
p->sectors[0] = p->sectors[1] = 0;
devfs_remove("%s/part%d", disk->devfs_name, part);
kobject_unregister(&p->kobj);
}