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[src/trunk]: src/sys/uvm Move the handling of PG_PAGEOUT from uvm_aio_aiodone...
details: https://anonhg.NetBSD.org/src/rev/6ad65696df13
branches: trunk
changeset: 941097:6ad65696df13
user: chs <chs%NetBSD.org@localhost>
date: Sun Oct 18 18:22:29 2020 +0000
description:
Move the handling of PG_PAGEOUT from uvm_aio_aiodone_pages() to
uvm_page_unbusy() so that all callers of uvm_page_unbusy() don't need to
handle this flag separately. Split out the pages part of uvm_aio_aiodone()
into uvm_aio_aiodone_pages() in rump just like in the real kernel.
In ZFS functions that can fail to copy data between the ARC and VM pages,
use uvm_aio_aiodone_pages() rather than uvm_page_unbusy() so that we can
handle these "I/O" errors. Fixes PR 55702.
diffstat:
sys/rump/librump/rumpvfs/vm_vfs.c | 52 +++++++++++++++++++++-----------------
sys/uvm/uvm_page.c | 18 ++++++++++---
sys/uvm/uvm_pager.c | 16 +----------
3 files changed, 45 insertions(+), 41 deletions(-)
diffs (185 lines):
diff -r 0a035636f32b -r 6ad65696df13 sys/rump/librump/rumpvfs/vm_vfs.c
--- a/sys/rump/librump/rumpvfs/vm_vfs.c Sun Oct 18 18:12:42 2020 +0000
+++ b/sys/rump/librump/rumpvfs/vm_vfs.c Sun Oct 18 18:22:29 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vm_vfs.c,v 1.38 2020/02/23 15:46:42 ad Exp $ */
+/* $NetBSD: vm_vfs.c,v 1.39 2020/10/18 18:22:29 chs Exp $ */
/*
* Copyright (c) 2008-2011 Antti Kantee. All Rights Reserved.
@@ -26,7 +26,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vm_vfs.c,v 1.38 2020/02/23 15:46:42 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vm_vfs.c,v 1.39 2020/10/18 18:22:29 chs Exp $");
#include <sys/param.h>
@@ -36,19 +36,37 @@
#include <uvm/uvm.h>
#include <uvm/uvm_readahead.h>
+void
+uvm_aio_aiodone_pages(struct vm_page **pgs, int npages, bool write, int error)
+{
+ struct uvm_object *uobj = pgs[0]->uobject;
+ struct vm_page *pg;
+ int i;
+
+ rw_enter(uobj->vmobjlock, RW_WRITER);
+ for (i = 0; i < npages; i++) {
+ pg = pgs[i];
+ KASSERT((pg->flags & PG_FAKE) == 0);
+ }
+ uvm_page_unbusy(pgs, npages);
+ rw_exit(uobj->vmobjlock);
+}
+
/*
- * release resources held during async io. this is almost the
- * same as uvm_aio_aiodone() from uvm_pager.c and only lacks the
- * call to uvm_aio_aiodone_pages(): unbusies pages directly here.
+ * Release resources held during async io.
*/
void
uvm_aio_aiodone(struct buf *bp)
{
struct uvm_object *uobj = NULL;
- int i, npages = bp->b_bufsize >> PAGE_SHIFT;
+ int npages = bp->b_bufsize >> PAGE_SHIFT;
struct vm_page **pgs;
vaddr_t va;
- int pageout = 0;
+ int i, error;
+ bool write;
+
+ error = bp->b_error;
+ write = BUF_ISWRITE(bp);
KASSERT(npages > 0);
pgs = kmem_alloc(npages * sizeof(*pgs), KM_SLEEP);
@@ -59,27 +77,15 @@
if (uobj == NULL) {
uobj = pgs[i]->uobject;
KASSERT(uobj != NULL);
- rw_enter(uobj->vmobjlock, RW_WRITER);
} else {
KASSERT(uobj == pgs[i]->uobject);
}
+ }
+ uvm_pagermapout((vaddr_t)bp->b_data, npages);
- if (pgs[i]->flags & PG_PAGEOUT) {
- KASSERT((pgs[i]->flags & PG_FAKE) == 0);
- pageout++;
- pgs[i]->flags &= ~PG_PAGEOUT;
- pgs[i]->flags |= PG_RELEASED;
- }
- }
- KASSERT(rw_write_held(uobj->vmobjlock));
+ uvm_aio_aiodone_pages(pgs, npages, write, error);
- uvm_page_unbusy(pgs, npages);
- rw_exit(uobj->vmobjlock);
-
- uvm_pagermapout((vaddr_t)bp->b_data, npages);
- uvm_pageout_done(pageout);
-
- if (BUF_ISWRITE(bp) && (bp->b_cflags & BC_AGE) != 0) {
+ if (write && (bp->b_cflags & BC_AGE) != 0) {
mutex_enter(bp->b_objlock);
vwakeup(bp);
mutex_exit(bp->b_objlock);
diff -r 0a035636f32b -r 6ad65696df13 sys/uvm/uvm_page.c
--- a/sys/uvm/uvm_page.c Sun Oct 18 18:12:42 2020 +0000
+++ b/sys/uvm/uvm_page.c Sun Oct 18 18:22:29 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_page.c,v 1.247 2020/09/20 10:30:05 skrll Exp $ */
+/* $NetBSD: uvm_page.c,v 1.248 2020/10/18 18:22:29 chs Exp $ */
/*-
* Copyright (c) 2019, 2020 The NetBSD Foundation, Inc.
@@ -95,7 +95,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_page.c,v 1.247 2020/09/20 10:30:05 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_page.c,v 1.248 2020/10/18 18:22:29 chs Exp $");
#include "opt_ddb.h"
#include "opt_uvm.h"
@@ -1602,9 +1602,10 @@
uvm_page_unbusy(struct vm_page **pgs, int npgs)
{
struct vm_page *pg;
- int i;
+ int i, pageout_done;
UVMHIST_FUNC(__func__); UVMHIST_CALLED(ubchist);
+ pageout_done = 0;
for (i = 0; i < npgs; i++) {
pg = pgs[i];
if (pg == NULL || pg == PGO_DONTCARE) {
@@ -1613,7 +1614,13 @@
KASSERT(uvm_page_owner_locked_p(pg, true));
KASSERT(pg->flags & PG_BUSY);
- KASSERT((pg->flags & PG_PAGEOUT) == 0);
+
+ if (pg->flags & PG_PAGEOUT) {
+ pg->flags &= ~PG_PAGEOUT;
+ pg->flags |= PG_RELEASED;
+ pageout_done++;
+ atomic_inc_uint(&uvmexp.pdfreed);
+ }
if (pg->flags & PG_RELEASED) {
UVMHIST_LOG(ubchist, "releasing pg %#jx",
(uintptr_t)pg, 0, 0, 0);
@@ -1632,6 +1639,9 @@
UVM_PAGE_OWN(pg, NULL);
}
}
+ if (pageout_done != 0) {
+ uvm_pageout_done(pageout_done);
+ }
}
/*
diff -r 0a035636f32b -r 6ad65696df13 sys/uvm/uvm_pager.c
--- a/sys/uvm/uvm_pager.c Sun Oct 18 18:12:42 2020 +0000
+++ b/sys/uvm/uvm_pager.c Sun Oct 18 18:22:29 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_pager.c,v 1.129 2020/08/14 09:06:15 chs Exp $ */
+/* $NetBSD: uvm_pager.c,v 1.130 2020/10/18 18:22:29 chs Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -32,7 +32,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_pager.c,v 1.129 2020/08/14 09:06:15 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_pager.c,v 1.130 2020/10/18 18:22:29 chs Exp $");
#include "opt_uvmhist.h"
#include "opt_readahead.h"
@@ -456,18 +456,6 @@
uvm_pageunlock(pg);
}
- /*
- * do accounting for pagedaemon i/o and arrange to free
- * the pages instead of just unbusying them.
- */
-
- if (pg->flags & PG_PAGEOUT) {
- pg->flags &= ~PG_PAGEOUT;
- pageout_done++;
- atomic_inc_uint(&uvmexp.pdfreed);
- pg->flags |= PG_RELEASED;
- }
-
#if defined(VMSWAP)
/*
* for swap pages, unlock everything for this page now.
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