04-02-2010
yep, forgot the "unstale", see updated command below.
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LEARN ABOUT SUNOS
kstat_io
kstat_io(9S) Data Structures for Drivers kstat_io(9S)
NAME
kstat_io - structure for I/O kstats
SYNOPSIS
#include <sys/types.h>
#include <sys/kstat.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
DESCRIPTION
I/O kstat statistics are kept in a kstat_io structure. When kstat_create(9F) creates an I/O kstat, the ks_data field is a pointer to one of
these structures. The macro KSTAT_IO_PTR() is provided to retrieve this field. It looks like this:
#define KSTAT_IO_PTR(kptr) ((kstat_io_t *)(kptr)->ks_data)
STRUCTURE MEMBERS
u_longlong_t nread; /* number of bytes read */
u_longlong_t nwritten; /* number of bytes written *]/
ulong_t reads; /* number of read operations */
ulong_t writes; /* number of write operations */
The nread field should be updated by the driver with the number of bytes successfully read upon completion.
The nwritten field should be updated by the driver with the number of bytes successfully written upon completion.
The reads field should be updated by the driver after each successful read operation.
The writes field should be updated by the driver after each successful write operation.
Other I/O statistics are updated through the use of the kstat_queue(9F) functions.
SEE ALSO
kstat_create(9F), kstat_named_init(9F), kstat_queue(9F), kstat_runq_back_to_waitq(9F), kstat_runq_enter(9F), kstat_runq_exit(9F),
kstat_waitq_enter(9F), kstat_waitq_exit(9F), kstat_waitq_to_runq(9F)
Writing Device Drivers
SunOS 5.10 4 Apr 1994 kstat_io(9S)