void osd_brw_stats_update(struct osd_device *osd, struct osd_iobuf *iobuf)
{
struct brw_stats *s = &osd->od_brw_stats;
unsigned long *last_block = NULL;
struct page **pages = iobuf->dr_pages;
struct page *last_page = NULL;
unsigned long discont_pages = 0;
unsigned long discont_blocks = 0;
unsigned long *blocks = iobuf->dr_blocks;
int i, nr_pages = iobuf->dr_npages;
int blocks_per_page;
int rw = iobuf->dr_rw;
if (unlikely(nr_pages == 0))
return;
blocks_per_page = PAGE_CACHE_SIZE >> osd_sb(osd)->s_blocksize_bits;
lprocfs_oh_tally_log2(&s->hist[BRW_R_PAGES+rw], nr_pages);
while (nr_pages-- > 0) {
if (last_page && (*pages)->index != (last_page->index + 1))
discont_pages++;
last_page = *pages;
pages++;
for (i = 0; i < blocks_per_page; i++) {
if (last_block && *blocks != (*last_block + 1))
discont_blocks++;
last_block = blocks++;
}
}
lprocfs_oh_tally(&s->hist[BRW_R_DISCONT_PAGES+rw], discont_pages);
lprocfs_oh_tally(&s->hist[BRW_R_DISCONT_BLOCKS+rw], discont_blocks);
}
static void record_start_io(struct osd_device *osd, int rw, int discont_pages)
{
struct obd_histogram *h = osd->od_brw_stats.hist;
if (rw == READ) {
atomic_inc(&osd->od_r_in_flight);
lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
atomic_read(&osd->od_r_in_flight));
lprocfs_oh_tally(&h[BRW_R_DISCONT_PAGES], discont_pages);
} else {
atomic_inc(&osd->od_w_in_flight);
lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
atomic_read(&osd->od_w_in_flight));
lprocfs_oh_tally(&h[BRW_W_DISCONT_PAGES], discont_pages);
}
}
