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[src/trunk]: src/sys/uvm Use atomic_{load, store}_relaxed() on global counters.
details: https://anonhg.NetBSD.org/src/rev/637a66db7ff1
branches: trunk
changeset: 846761:637a66db7ff1
user: maxv <maxv%NetBSD.org@localhost>
date: Sun Dec 01 08:19:09 2019 +0000
description:
Use atomic_{load,store}_relaxed() on global counters.
diffstat:
sys/uvm/uvm_fault.c | 55 ++++++++++++++++++++++++++++++++++------------------
1 files changed, 36 insertions(+), 19 deletions(-)
diffs (186 lines):
diff -r 15d7c5285f55 -r 637a66db7ff1 sys/uvm/uvm_fault.c
--- a/sys/uvm/uvm_fault.c Sun Dec 01 08:16:49 2019 +0000
+++ b/sys/uvm/uvm_fault.c Sun Dec 01 08:19:09 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_fault.c,v 1.208 2019/11/10 20:38:33 chs Exp $ */
+/* $NetBSD: uvm_fault.c,v 1.209 2019/12/01 08:19:09 maxv Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -32,7 +32,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_fault.c,v 1.208 2019/11/10 20:38:33 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_fault.c,v 1.209 2019/12/01 08:19:09 maxv Exp $");
#include "opt_uvmhist.h"
@@ -284,7 +284,8 @@
KASSERT(anon->an_lock == amap->am_lock);
/* Increment the counters.*/
- uvmexp.fltanget++;
+ atomic_store_relaxed(&uvmexp.fltanget,
+ atomic_load_relaxed(&uvmexp.fltanget) + 1);
if (anon->an_page) {
curlwp->l_ru.ru_minflt++;
} else {
@@ -331,7 +332,8 @@
return 0;
}
pg->flags |= PG_WANTED;
- uvmexp.fltpgwait++;
+ atomic_store_relaxed(&uvmexp.fltpgwait,
+ atomic_load_relaxed(&uvmexp.fltpgwait) + 1);
/*
* The last unlock must be an atomic unlock and wait
@@ -366,7 +368,8 @@
if (pg == NULL) {
/* Out of memory. Wait a little. */
uvmfault_unlockall(ufi, amap, NULL);
- uvmexp.fltnoram++;
+ atomic_store_relaxed(&uvmexp.fltnoram,
+ atomic_load_relaxed(&uvmexp.fltnoram) + 1);
UVMHIST_LOG(maphist, " noram -- UVM_WAIT",0,
0,0,0);
if (!uvm_reclaimable()) {
@@ -385,7 +388,8 @@
* to read an_swslot here, because we hold
* PG_BUSY on the page.
*/
- uvmexp.pageins++;
+ atomic_store_relaxed(&uvmexp.pageins,
+ atomic_load_relaxed(&uvmexp.pageins) + 1);
error = uvm_swap_get(pg, anon->an_swslot,
PGO_SYNCIO);
@@ -526,7 +530,8 @@
* Retry..
*/
- uvmexp.fltanretry++;
+ atomic_store_relaxed(&uvmexp.fltanretry,
+ atomic_load_relaxed(&uvmexp.fltanretry) + 1);
continue;
}
/*NOTREACHED*/
@@ -627,13 +632,15 @@
uvmfault_unlockall(ufi, amap, uobj);
if (!uvm_reclaimable()) {
UVMHIST_LOG(maphist, "out of VM", 0,0,0,0);
- uvmexp.fltnoanon++;
+ atomic_store_relaxed(&uvmexp.fltnoanon,
+ atomic_load_relaxed(&uvmexp.fltnoanon) + 1);
error = ENOMEM;
goto done;
}
UVMHIST_LOG(maphist, "out of RAM, waiting for more", 0,0,0,0);
- uvmexp.fltnoram++;
+ atomic_store_relaxed(&uvmexp.fltnoram,
+ atomic_load_relaxed(&uvmexp.fltnoram) + 1);
uvm_wait("flt_noram5");
error = ERESTART;
goto done;
@@ -1026,7 +1033,8 @@
" need to clear needs_copy and refault",0,0,0,0);
uvmfault_unlockmaps(ufi, false);
uvmfault_amapcopy(ufi);
- uvmexp.fltamcopy++;
+ atomic_store_relaxed(&uvmexp.fltamcopy,
+ atomic_load_relaxed(&uvmexp.fltamcopy) + 1);
return ERESTART;
} else {
@@ -1269,7 +1277,8 @@
UVMHIST_LOG(maphist,
" MAPPING: n anon: pm=%#jx, va=%#jx, pg=%#jx",
(uintptr_t)ufi->orig_map->pmap, currva, (uintptr_t)pg, 0);
- uvmexp.fltnamap++;
+ atomic_store_relaxed(&uvmexp.fltnamap,
+ atomic_load_relaxed(&uvmexp.fltnamap) + 1);
/*
* Since this page isn't the page that's actually faulting,
@@ -1465,7 +1474,8 @@
UVMHIST_FUNC("uvm_fault_upper_promote"); UVMHIST_CALLED(maphist);
UVMHIST_LOG(maphist, " case 1B: COW fault",0,0,0,0);
- uvmexp.flt_acow++;
+ atomic_store_relaxed(&uvmexp.flt_acow,
+ atomic_load_relaxed(&uvmexp.flt_acow) + 1);
error = uvmfault_promote(ufi, oanon, PGO_DONTCARE, &anon,
&flt->anon_spare);
@@ -1513,7 +1523,8 @@
struct vm_page *pg;
UVMHIST_FUNC("uvm_fault_upper_direct"); UVMHIST_CALLED(maphist);
- uvmexp.flt_anon++;
+ atomic_store_relaxed(&uvmexp.flt_anon,
+ atomic_load_relaxed(&uvmexp.flt_anon) + 1);
pg = anon->an_page;
if (anon->an_ref > 1) /* disallow writes to ref > 1 anons */
flt->enter_prot = flt->enter_prot & ~VM_PROT_WRITE;
@@ -1782,7 +1793,8 @@
mutex_enter(uobj->vmobjlock);
/* Locked: maps(read), amap(if there), uobj */
- uvmexp.fltlget++;
+ atomic_store_relaxed(&uvmexp.fltlget,
+ atomic_load_relaxed(&uvmexp.fltlget) + 1);
gotpages = flt->npages;
(void) uobj->pgops->pgo_get(uobj,
ufi->entry->offset + flt->startva - ufi->entry->start,
@@ -1856,7 +1868,8 @@
UVMHIST_LOG(maphist,
" MAPPING: n obj: pm=%#jx, va=%#jx, pg=%#jx",
(uintptr_t)ufi->orig_map->pmap, currva, (uintptr_t)pg, 0);
- uvmexp.fltnomap++;
+ atomic_store_relaxed(&uvmexp.fltnomap,
+ atomic_load_relaxed(&uvmexp.fltnomap) + 1);
/*
* Since this page isn't the page that's actually faulting,
@@ -1922,7 +1935,8 @@
/* Locked: uobj */
KASSERT(uobj == NULL || mutex_owned(uobj->vmobjlock));
- uvmexp.fltget++;
+ atomic_store_relaxed(&uvmexp.fltget,
+ atomic_load_relaxed(&uvmexp.fltget) + 1);
gotpages = 1;
pg = NULL;
error = uobj->pgops->pgo_get(uobj, uoff, &pg, &gotpages,
@@ -2005,7 +2019,8 @@
pg->flags &= ~(PG_BUSY | PG_WANTED);
UVM_PAGE_OWN(pg, NULL);
} else {
- uvmexp.fltpgrele++;
+ atomic_store_relaxed(&uvmexp.fltpgrele,
+ atomic_load_relaxed(&uvmexp.fltpgrele) + 1);
uvm_pagefree(pg);
}
mutex_exit(uobj->vmobjlock);
@@ -2049,7 +2064,8 @@
* set "pg" to the page we want to map in (uobjpage, usually)
*/
- uvmexp.flt_obj++;
+ atomic_store_relaxed(&uvmexp.flt_obj,
+ atomic_load_relaxed(&uvmexp.flt_obj) + 1);
if (UVM_ET_ISCOPYONWRITE(ufi->entry) ||
UVM_OBJ_NEEDS_WRITEFAULT(uobjpage->uobject))
flt->enter_prot &= ~VM_PROT_WRITE;
@@ -2112,7 +2128,8 @@
UVMHIST_LOG(maphist,
" out of RAM breaking loan, waiting",
0,0,0,0);
- uvmexp.fltnoram++;
+ atomic_store_relaxed(&uvmexp.fltnoram,
+ atomic_load_relaxed(&uvmexp.fltnoram) + 1);
uvm_wait("flt_noram4");
return ERESTART;
}
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