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evcnt mmio window statistics

This commit is contained in:
pooka 2009-04-16 10:26:34 +00:00
parent 14ec16f84a
commit 15db645a13
1 changed files with 18 additions and 2 deletions
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20
sys/rump/librump/rumpvfs/rumpblk.c
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@ -1,4 +1,4 @@
/* $NetBSD: rumpblk.c,v 1.17 2009/04/07 18:34:18 pooka Exp $ */
/* $NetBSD: rumpblk.c,v 1.18 2009/04/16 10:26:34 pooka Exp $ */
/*
* Copyright (c) 2009 Antti Kantee. All Rights Reserved.
@ -43,13 +43,14 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rumpblk.c,v 1.17 2009/04/07 18:34:18 pooka Exp $");
__KERNEL_RCSID(0, "$NetBSD: rumpblk.c,v 1.18 2009/04/16 10:26:34 pooka Exp $");
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/condvar.h>
#include <sys/disklabel.h>
#include <sys/evcnt.h>
#include <sys/fcntl.h>
#include <sys/kmem.h>
#include <sys/malloc.h>
@ -100,6 +101,10 @@ static struct rblkdev {
struct disklabel rblk_dl;
} minors[RUMPBLK_SIZE];
static struct evcnt memblk_ev_reqs;
static struct evcnt memblk_ev_hits;
static struct evcnt memblk_ev_busy;
dev_type_open(rumpblk_open);
dev_type_close(rumpblk_close);
dev_type_read(rumpblk_read);
@ -136,6 +141,7 @@ getwindow(struct rblkdev *rblk, off_t off, int *wsize, int *error)
struct blkwin *win;
mutex_enter(&rblk->rblk_memmtx);
memblk_ev_reqs.ev_count++;
retry:
/* search for window */
TAILQ_FOREACH(win, &rblk->rblk_lruq, win_lru) {
@ -145,6 +151,7 @@ getwindow(struct rblkdev *rblk, off_t off, int *wsize, int *error)
/* found? return */
if (win) {
memblk_ev_hits.ev_count++;
TAILQ_REMOVE(&rblk->rblk_lruq, win, win_lru);
goto good;
}
@ -180,6 +187,8 @@ getwindow(struct rblkdev *rblk, off_t off, int *wsize, int *error)
}
} else {
DPRINTF(("memwin wait\n"));
memblk_ev_busy.ev_count++;
rblk->rblk_waiting = true;
cv_wait(&rblk->rblk_memcv, &rblk->rblk_memmtx);
goto retry;
@ -257,6 +266,13 @@ rumpblk_init(void)
cv_init(&minors[i].rblk_memcv, "rblkmcv");
}
evcnt_attach_dynamic(&memblk_ev_reqs, EVCNT_TYPE_MISC, NULL,
"rumpblk", "memblk requests");
evcnt_attach_dynamic(&memblk_ev_hits, EVCNT_TYPE_MISC, NULL,
"rumpblk", "memblk window hits");
evcnt_attach_dynamic(&memblk_ev_busy, EVCNT_TYPE_MISC, NULL,
"rumpblk", "memblk all windows busy");
if (blkfail) {
return devsw_attach("rumpblk", &rumpblk_bdevsw_fail, &rumpblk,
&rumpblk_cdevsw, &rumpblk);