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Add a sysctl hashstat collector for ubchash.

This commit is contained in:
simonb 2021-04-01 06:26:26 +00:00
parent 0f9be9e9e2
commit 688f1f85ca
1 changed files with 38 additions and 2 deletions
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40
sys/uvm/uvm_bio.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_bio.c,v 1.125 2021/03/13 15:29:55 skrll Exp $ */
/* $NetBSD: uvm_bio.c,v 1.126 2021/04/01 06:26:26 simonb Exp $ */
/*
* Copyright (c) 1998 Chuck Silvers.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.125 2021/03/13 15:29:55 skrll Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.126 2021/04/01 06:26:26 simonb Exp $");
#include "opt_uvmhist.h"
#include "opt_ubc.h"
@ -44,6 +44,7 @@ __KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.125 2021/03/13 15:29:55 skrll Exp $");
#include <sys/kmem.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/bitops.h> /* for ilog2() */
@ -61,6 +62,7 @@ __KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.125 2021/03/13 15:29:55 skrll Exp $");
static int ubc_fault(struct uvm_faultinfo *, vaddr_t, struct vm_page **,
int, int, vm_prot_t, int);
static struct ubc_map *ubc_find_mapping(struct uvm_object *, voff_t);
static int ubchash_stats(struct hashstat_sysctl *hs, bool fill);
#ifdef UBC_USE_PMAP_DIRECT
static int __noinline ubc_uiomove_direct(struct uvm_object *, struct uio *, vsize_t,
int, int);
@ -215,6 +217,8 @@ ubc_init(void)
UVM_ADV_RANDOM, UVM_FLAG_NOMERGE)) != 0) {
panic("ubc_init: failed to map ubc_object");
}
hashstat_register("ubchash", ubchash_stats);
}
void
@ -1104,3 +1108,35 @@ ubc_purge(struct uvm_object *uobj)
}
rw_exit(ubc_object.uobj.vmobjlock);
}
static int
ubchash_stats(struct hashstat_sysctl *hs, bool fill)
{
struct ubc_map *umap;
uint64_t chain;
strlcpy(hs->hash_name, "ubchash", sizeof(hs->hash_name));
strlcpy(hs->hash_desc, "ubc object hash", sizeof(hs->hash_desc));
if (!fill)
return 0;
hs->hash_size = ubc_object.hashmask + 1;
for (size_t i = 0; i < hs->hash_size; i++) {
chain = 0;
rw_enter(ubc_object.uobj.vmobjlock, RW_READER);
LIST_FOREACH(umap, &ubc_object.hash[i], hash) {
chain++;
}
rw_exit(ubc_object.uobj.vmobjlock);
if (chain > 0) {
hs->hash_used++;
hs->hash_items += chain;
if (chain > hs->hash_maxchain)
hs->hash_maxchain = chain;
}
preempt_point();
}
return 0;
}