04-22-2009
Hi,
Thanks. Going through it I don't see any specific calculation for Page Cache total used by fs execs and libraries etc. To put it differently, I'm basically interested to know how mdb -k using ::memstat calculated the below values:
Exec and libs 9215 35 5%
Page cache 10138 39 5%
I'm interested in getting the same numbers using kstat or other built ins but can't find decent documentation or an explanation of kstat values to be able to tell what all of them mean. I'm also interested to know if this value resides within the used portion of memory as reported by vmstat 'free' field, which I would expect as I'm finding hints here and there that this portion resides elsewhere and wanted to clear this up.
Thanks,
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LEARN ABOUT SUNOS
kstat_lookup
kstat_lookup(3KSTAT) Kernel Statistics Library Functions kstat_lookup(3KSTAT)
NAME
kstat_lookup, kstat_data_lookup - find a kstat by name
SYNOPSIS
cc [ flag... ] file... -lkstat [ library...]
#include <kstat.h>
kstat_t *kstat_lookup(kstat_ctl_t *kc, char *ks_module, int ks_instance, char *ks_name);
void *kstat_data_lookup(kstat_t *ksp, char *name);
DESCRIPTION
The kstat_lookup() function traverses the kstat chain, kc->kc_chain, searching for a kstat with the same ks_module, ks_instance, and
ks_name fields; this triplet uniquely identifies a kstat. If ks_module is NULL, ks_instance is -1, or ks_name is NULL, those fields will
be ignored in the search. For example, kstat_lookup(kc, NULL, -1, "foo") will find the first kstat with name "foo".
The kstat_data_lookup() function searches the kstat's data section for the record with the specified name. This operation is valid only for
those kstat types that have named data records: KSTAT_TYPE_NAMED and KSTAT_TYPE_TIMER.
RETURN VALUES
The kstat_lookup() function returns a pointer to the requested kstat if it is found. Otherwise it returns NULL and sets errno to indicate
the error.
The kstat_data_lookup() function returns a pointer to the requested data record if it is found. Otherwise it returns NULL and sets errno to
indicate the error .
ERRORS
The kstat_lookup() and kstat_data_lookup() functions will fail if:
EINVAL An attempt was made to look up data for a kstat that was not of type KSTAT_TYPE_NAMED or KSTAT_TYPE_TIMER.
ENOENT The requested kstat could not be found.
FILES
/dev/kstat kernel statistics driver
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Stable |
+-----------------------------+-----------------------------+
|MT-Level |Unsafe |
+-----------------------------+-----------------------------+
SEE ALSO
kstat(3KSTAT), kstat_chain_update(3KSTAT), kstat_open(3KSTAT), kstat_read(3KSTAT), attributes(5)
SunOS 5.10 3 Aug 2004 kstat_lookup(3KSTAT)