lsblk: add queue request size attribute

Add queue request size parameter.

Very useful for tuning multipath performance.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/misc-utils/lsblk.c b/misc-utils/lsblk.c
index 259b77093a70f30a3d3a7476e19c958c23228808..e64eb9984352049b1e6624a3f67e2d17e72a728b 100644 (file)
--- a/misc-utils/lsblk.c
+++ b/misc-utils/lsblk.c
@@ -78,6 +78,7 @@ enum {
        COL_LOGSEC,
        COL_ROTA,
        COL_SCHED,
+       COL_RQ_SIZE,
        COL_TYPE,
        COL_DALIGN,
        COL_DGRAN,
@@ -119,6 +120,7 @@ static struct colinfo infos[__NCOLUMNS] = {
        [COL_PHYSEC] = { "PHY-SEC", 7, TT_FL_RIGHT, N_("physical sector size") },
        [COL_LOGSEC] = { "LOG-SEC", 7, TT_FL_RIGHT, N_("logical sector size") },
        [COL_SCHED]  = { "SCHED",   0.1, 0, N_("I/O scheduler name") },
+       [COL_RQ_SIZE]= { "RQ-SIZE", 5, TT_FL_RIGHT, N_("request queue size") },
        [COL_TYPE]   = { "TYPE",    4, 0, N_("device type") },
        [COL_DALIGN] = { "DISC-ALN", 6, TT_FL_RIGHT, N_("discard alignment offset") },
        [COL_DGRAN]  = { "DISC-GRAN", 6, TT_FL_RIGHT, N_("discard granularity") },
@@ -565,6 +567,11 @@ static void set_tt_data(struct blkdev_cxt *cxt, int col, int id, struct tt_line
                if (p)
                        tt_line_set_data(ln, col, p);
                break;
+       case COL_RQ_SIZE:
+               p = sysfs_strdup(&cxt->sysfs, "queue/nr_requests");
+               if (p)
+                       tt_line_set_data(ln, col, p);
+               break;
        case COL_TYPE:
                p = get_type(cxt);
                if (p)
@@ -976,6 +983,7 @@ int main(int argc, char *argv[])
                        columns[ncolumns++] = COL_LOGSEC;
                        columns[ncolumns++] = COL_ROTA;
                        columns[ncolumns++] = COL_SCHED;
+                       columns[ncolumns++] = COL_RQ_SIZE;
                        break;
                default:
                        help(stderr);