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Add basic dynamic kstat support

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Add the bare minimum functionality to support dynamic kstats.  A
complete kstat implementation should be done as part of issue #84.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #84
This commit is contained in:
Brian Behlendorf 2012-01-30 12:15:31 -08:00
parent 4b2220f0b9
commit 9a8b7a7458
2 changed files with 22 additions and 1 deletions
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11
include/sys/kstat.h
View File

@ -72,7 +72,14 @@
#define KS_MAGIC 0x9d9d9d9d #define KS_MAGIC 0x9d9d9d9d
typedef int kid_t; /* unique kstat id */ /* Dynamic updates */
#define KSTAT_READ 0
#define KSTAT_WRITE 1
struct kstat_s;
typedef int kid_t; /* unique kstat id */
typedef int kstat_update_t(struct kstat_s *, int); /* dynamic update cb */
typedef struct kstat_s { typedef struct kstat_s {
int ks_magic; /* magic value */ int ks_magic; /* magic value */
@ -89,6 +96,8 @@ typedef struct kstat_s {
uint_t ks_ndata; /* # of type-specific data records */ uint_t ks_ndata; /* # of type-specific data records */
size_t ks_data_size; /* size of kstat data section */ size_t ks_data_size; /* size of kstat data section */
struct proc_dir_entry *ks_proc; /* proc linkage */ struct proc_dir_entry *ks_proc; /* proc linkage */
kstat_update_t *ks_update; /* dynamic updates */
void *ks_private; /* private data */
spinlock_t ks_lock; /* kstat data lock */ spinlock_t ks_lock; /* kstat data lock */
struct list_head ks_list; /* kstat linkage */ struct list_head ks_list; /* kstat linkage */
} kstat_t; } kstat_t;

12
module/spl/spl-kstat.c
View File

@ -223,6 +223,13 @@ kstat_seq_show(struct seq_file *f, void *p)
return rc; return rc;
} }
int
kstat_default_update(kstat_t *ksp, int rw)
{
ASSERT(ksp != NULL);
return 0;
}
static void * static void *
kstat_seq_data_addr(kstat_t *ksp, loff_t n) kstat_seq_data_addr(kstat_t *ksp, loff_t n)
{ {
@ -260,6 +267,9 @@ kstat_seq_start(struct seq_file *f, loff_t *pos)
ASSERT(ksp->ks_magic == KS_MAGIC); ASSERT(ksp->ks_magic == KS_MAGIC);
SENTRY; SENTRY;
/* Dynamically update kstat, on error existing kstats are used */
(void) ksp->ks_update(ksp, KSTAT_READ);
spin_lock(&ksp->ks_lock); spin_lock(&ksp->ks_lock);
ksp->ks_snaptime = gethrtime(); ksp->ks_snaptime = gethrtime();
@ -361,6 +371,8 @@ __kstat_create(const char *ks_module, int ks_instance, const char *ks_name,
strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN); strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN);
ksp->ks_type = ks_type; ksp->ks_type = ks_type;
ksp->ks_flags = ks_flags; ksp->ks_flags = ks_flags;
ksp->ks_update = kstat_default_update;
ksp->ks_private = NULL;
switch (ksp->ks_type) { switch (ksp->ks_type) {
case KSTAT_TYPE_RAW: case KSTAT_TYPE_RAW: