pvsync2: Add hipri_percentage option

[fio.git] / engines / sync.c

diff --git a/engines/sync.c b/engines/sync.c
index e76bbbb49e237b807c855d74dd0e40995ef7c0ad..26b98b60e2c7896e846c6b0daa2a1ad138b8b6fb 100644 (file)
--- a/engines/sync.c
+++ b/engines/sync.c
@@ -14,6 +14,7 @@
 
 #include "../fio.h"
 #include "../optgroup.h"
+#include "../lib/rand.h"
 
 /*
  * Sync engine uses engine_data to store last offset
@@ -30,12 +31,15 @@ struct syncio_data {
        unsigned long long last_offset;
        struct fio_file *last_file;
        enum fio_ddir last_ddir;
+
+       struct frand_state rand_state;
 };
 
 #ifdef FIO_HAVE_PWRITEV2
 struct psyncv2_options {
        void *pad;
        unsigned int hipri;
+       unsigned int hipri_percentage;
 };
 
 static struct fio_option options[] = {
@@ -48,6 +52,18 @@ static struct fio_option options[] = {
                .category = FIO_OPT_C_ENGINE,
                .group  = FIO_OPT_G_INVALID,
        },
+       {
+               .name   = "hipri_percentage",
+               .lname  = "RWF_HIPRI_PERCENTAGE",
+               .type   = FIO_OPT_INT,
+               .off1   = offsetof(struct psyncv2_options, hipri_percentage),
+               .minval = 0,
+               .maxval = 100,
+               .def    = "100",
+               .help   = "Probabilistically set RWF_HIPRI for pwritev2/preadv2",
+               .category = FIO_OPT_C_ENGINE,
+               .group  = FIO_OPT_G_INVALID,
+       },
        {
                .name   = NULL,
        },
@@ -132,7 +148,8 @@ static int fio_pvsyncio2_queue(struct thread_data *td, struct io_u *io_u)
 
        fio_ro_check(td, io_u);
 
-       if (o->hipri)
+       if (o->hipri &&
+           (rand32_between(&sd->rand_state, 1, 100) <= o->hipri_percentage))
                flags |= RWF_HIPRI;
 
        iov->iov_base = io_u->xfer_buf;
@@ -363,6 +380,7 @@ static int fio_vsyncio_init(struct thread_data *td)
        sd->last_offset = -1ULL;
        sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
        sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
+       init_rand(&sd->rand_state, 0);
 
        td->io_ops_data = sd;
        return 0;