Allow the user to set the probability of a pvsync2 IO being high
priority. Add a new option for the pvsync2 engine called
--hipri_percentage will takes values in the range (0, 100) and use
that as a probability for setting RWF_HIPRI. The default for this
option is 100 so exisiting users of --hirpi are unaffected.
Changes since v3:
Remove unwanted #ifdefs
Changes since v2:
s/_probability/_percentage/
Changes since v1:
Use --hipri_probability rather than impacting --hipri
Correct the random number generator call
Signed-off-by: Stephen Bates <sbates@raithlin.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Set RWF_HIPRI on I/O, indicating to the kernel that it's of higher priority
than normal.
Set RWF_HIPRI on I/O, indicating to the kernel that it's of higher priority
than normal.
+.. option:: hipri_percentage : [pvsync2]
+
+ When hipri is set this determines the probability of a pvsync2 IO being high
+ priority. The default is 100%.
+
.. option:: cpuload=int : [cpuio]
Attempt to use the specified percentage of CPU cycles. This is a mandatory
.. option:: cpuload=int : [cpuio]
Attempt to use the specified percentage of CPU cycles. This is a mandatory
#include "../fio.h"
#include "../optgroup.h"
#include "../fio.h"
#include "../optgroup.h"
+#include "../lib/rand.h"
/*
* Sync engine uses engine_data to store last offset
/*
* Sync engine uses engine_data to store last offset
unsigned long long last_offset;
struct fio_file *last_file;
enum fio_ddir last_ddir;
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;
};
#ifdef FIO_HAVE_PWRITEV2
struct psyncv2_options {
void *pad;
unsigned int hipri;
+ unsigned int hipri_percentage;
};
static struct fio_option options[] = {
};
static struct fio_option options[] = {
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_INVALID,
},
.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,
+ },
+ if (o->hipri &&
+ (rand32_between(&sd->rand_state, 1, 100) <= o->hipri_percentage))
flags |= RWF_HIPRI;
iov->iov_base = io_u->xfer_buf;
flags |= RWF_HIPRI;
iov->iov_base = io_u->xfer_buf;
sd->last_offset = -1ULL;
sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
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;
td->io_ops_data = sd;
return 0;
Set RWF_HIPRI on IO, indicating to the kernel that it's of
higher priority than normal.
.TP
Set RWF_HIPRI on IO, indicating to the kernel that it's of
higher priority than normal.
.TP
+.BI (pvsync2)hipri_percentage
+When hipri is set this determines the probability of a pvsync2 IO being high
+priority. The default is 100%.
+.TP
.BI (net,netsplice)hostname \fR=\fPstr
The host name or IP address to use for TCP or UDP based IO.
If the job is a TCP listener or UDP reader, the hostname is not
.BI (net,netsplice)hostname \fR=\fPstr
The host name or IP address to use for TCP or UDP based IO.
If the job is a TCP listener or UDP reader, the hostname is not