LU-15564 osd: add allocation time histogram

add block mapping/allocation histogram to brw stats to debug
mballoc related issues.

$ lctl get_param osd*.*OST*.brw_stats
                           read      |     write
block maps msec        maps  % cum % |  maps        % cum %
1:		   1522360 100 100   | 49272  99  99
2:		         0   0 100   |    1   0  99
4:		         0   0 100   |    1   0  99
8:		         0   0 100   |    0   0  99
16:		         0   0 100   |    0   0  99
32:		         0   0 100   |    0   0  99
64:		         0   0 100   |    1   0 100

Lustre-change: https://review.whamcloud.com/46550
Lustre-commit: f97ce54357bc91f7b1285febfc50d6087dd94c13

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I1185386adc64e844de71e25a4e439e493e5e5bc5
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52767
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>

diff --git a/lustre/include/lprocfs_status.h b/lustre/include/lprocfs_status.h
index ce38b0d..32ce0e8 100644 (file)
--- a/lustre/include/lprocfs_status.h
+++ b/lustre/include/lprocfs_status.h
@@ -394,6 +394,8 @@ enum brw_rw_stats {
        BRW_W_IO_TIME,
        BRW_R_DISK_IOSIZE,
        BRW_W_DISK_IOSIZE,
+       BRW_MAP_TIME,
+       BRW_ALLOC_TIME,
        BRW_RW_STATS_NUM,
 };
 

diff --git a/lustre/obdclass/lprocfs_status_server.c b/lustre/obdclass/lprocfs_status_server.c
index f5afac2..d785c50 100644 (file)
--- a/lustre/obdclass/lprocfs_status_server.c
+++ b/lustre/obdclass/lprocfs_status_server.c
@@ -735,6 +735,9 @@ static const struct brw_stats_props brw_props[] = {
        { .bsp_name     = "disk I/O size",
          .bsp_units    = "ios",
          .bsp_scale    = true                          },
+       { .bsp_name     = "block maps msec",
+         .bsp_units    = "maps",
+         .bsp_scale    = true,                         },
 };
 
 static int brw_stats_seq_show(struct seq_file *seq, void *v)

diff --git a/lustre/osd-ldiskfs/osd_io.c b/lustre/osd-ldiskfs/osd_io.c
index 9ba4b10..831406d 100644 (file)
--- a/lustre/osd-ldiskfs/osd_io.c
+++ b/lustre/osd-ldiskfs/osd_io.c
@@ -1121,6 +1121,7 @@ static int osd_ldiskfs_map_inode_pages(struct inode *inode,
        while (i < pages) {
                long blen, total = 0, previous_total = 0;
                struct ldiskfs_map_blocks map = { 0 };
+               ktime_t time;
 
                if (fp == NULL) { /* start new extent */
                        fp = *page++;
@@ -1176,9 +1177,19 @@ cont_map:
                if (osd->od_extents_dense && compressed)
                        create |= LDISKFS_GET_BLOCKS_VERY_DENSE;
 #endif
+
+               time = ktime_get();
                rc = ldiskfs_map_blocks(handle, inode, &map, create);
+               time = ktime_sub(ktime_get(), time);
+
                if (rc >= 0) {
-                       int c = 0;
+                       struct brw_stats *h = &osd->od_brw_stats;
+                       int idx, c = 0;
+
+                       idx = map.m_flags & LDISKFS_MAP_NEW ?
+                               BRW_ALLOC_TIME : BRW_MAP_TIME;
+                       lprocfs_oh_tally_log2(&h->bs_hist[idx],
+                                             ktime_to_ms(time));
 
                        for (; total < blen && c < map.m_len; c++, total++) {
                                if (rc == 0) {