> Date: Tue, 10 May 2022 18:45:21 +0200
> From: Martin Pieuchot <[email protected]>
>
> On 05/05/22(Thu) 14:54, Martin Pieuchot wrote:
> > Diff below introduces a new wrapper to manipulate active/inactive page
> > queues.
> >
> > ok?
>
> Anyone?
Sorry I started looking at this and got distracted.
I'm not sure about the changes to uvm_pageactivate(). It doesn't
quite match what NetBSD does, but I guess NetBSD assumes that
uvm_pageactiave() isn't called for a page that is already active? And
that's something we can't guarantee?
The diff is correct though in the sense that it is equivalent to the
code we already have. So if this definitely is the direction you want
to go:
ok kettenis@
> > Index: uvm/uvm_page.c
> > ===================================================================
> > RCS file: /cvs/src/sys/uvm/uvm_page.c,v
> > retrieving revision 1.165
> > diff -u -p -r1.165 uvm_page.c
> > --- uvm/uvm_page.c 4 May 2022 14:58:26 -0000 1.165
> > +++ uvm/uvm_page.c 5 May 2022 12:49:13 -0000
> > @@ -987,16 +987,7 @@ uvm_pageclean(struct vm_page *pg)
> > /*
> > * now remove the page from the queues
> > */
> > - if (pg->pg_flags & PQ_ACTIVE) {
> > - TAILQ_REMOVE(&uvm.page_active, pg, pageq);
> > - flags_to_clear |= PQ_ACTIVE;
> > - uvmexp.active--;
> > - }
> > - if (pg->pg_flags & PQ_INACTIVE) {
> > - TAILQ_REMOVE(&uvm.page_inactive, pg, pageq);
> > - flags_to_clear |= PQ_INACTIVE;
> > - uvmexp.inactive--;
> > - }
> > + uvm_pagedequeue(pg);
> >
> > /*
> > * if the page was wired, unwire it now.
> > @@ -1243,16 +1234,7 @@ uvm_pagewire(struct vm_page *pg)
> > MUTEX_ASSERT_LOCKED(&uvm.pageqlock);
> >
> > if (pg->wire_count == 0) {
> > - if (pg->pg_flags & PQ_ACTIVE) {
> > - TAILQ_REMOVE(&uvm.page_active, pg, pageq);
> > - atomic_clearbits_int(&pg->pg_flags, PQ_ACTIVE);
> > - uvmexp.active--;
> > - }
> > - if (pg->pg_flags & PQ_INACTIVE) {
> > - TAILQ_REMOVE(&uvm.page_inactive, pg, pageq);
> > - atomic_clearbits_int(&pg->pg_flags, PQ_INACTIVE);
> > - uvmexp.inactive--;
> > - }
> > + uvm_pagedequeue(pg);
> > uvmexp.wired++;
> > }
> > pg->wire_count++;
> > @@ -1324,28 +1306,32 @@ uvm_pageactivate(struct vm_page *pg)
> > KASSERT(uvm_page_owner_locked_p(pg));
> > MUTEX_ASSERT_LOCKED(&uvm.pageqlock);
> >
> > + uvm_pagedequeue(pg);
> > + if (pg->wire_count == 0) {
> > + TAILQ_INSERT_TAIL(&uvm.page_active, pg, pageq);
> > + atomic_setbits_int(&pg->pg_flags, PQ_ACTIVE);
> > + uvmexp.active++;
> > +
> > + }
> > +}
> > +
> > +/*
> > + * uvm_pagedequeue: remove a page from any paging queue
> > + */
> > +void
> > +uvm_pagedequeue(struct vm_page *pg)
> > +{
> > + if (pg->pg_flags & PQ_ACTIVE) {
> > + TAILQ_REMOVE(&uvm.page_active, pg, pageq);
> > + atomic_clearbits_int(&pg->pg_flags, PQ_ACTIVE);
> > + uvmexp.active--;
> > + }
> > if (pg->pg_flags & PQ_INACTIVE) {
> > TAILQ_REMOVE(&uvm.page_inactive, pg, pageq);
> > atomic_clearbits_int(&pg->pg_flags, PQ_INACTIVE);
> > uvmexp.inactive--;
> > }
> > - if (pg->wire_count == 0) {
> > - /*
> > - * if page is already active, remove it from list so we
> > - * can put it at tail. if it wasn't active, then mark
> > - * it active and bump active count
> > - */
> > - if (pg->pg_flags & PQ_ACTIVE)
> > - TAILQ_REMOVE(&uvm.page_active, pg, pageq);
> > - else {
> > - atomic_setbits_int(&pg->pg_flags, PQ_ACTIVE);
> > - uvmexp.active++;
> > - }
> > -
> > - TAILQ_INSERT_TAIL(&uvm.page_active, pg, pageq);
> > - }
> > }
> > -
> > /*
> > * uvm_pagezero: zero fill a page
> > */
> > Index: uvm/uvm_page.h
> > ===================================================================
> > RCS file: /cvs/src/sys/uvm/uvm_page.h,v
> > retrieving revision 1.67
> > diff -u -p -r1.67 uvm_page.h
> > --- uvm/uvm_page.h 29 Jan 2022 06:25:33 -0000 1.67
> > +++ uvm/uvm_page.h 5 May 2022 12:49:13 -0000
> > @@ -224,6 +224,7 @@ boolean_t uvm_page_physget(paddr_t *);
> > #endif
> >
> > void uvm_pageactivate(struct vm_page *);
> > +void uvm_pagedequeue(struct vm_page *);
> > vaddr_t uvm_pageboot_alloc(vsize_t);
> > void uvm_pagecopy(struct vm_page *, struct vm_page *);
> > void uvm_pagedeactivate(struct vm_page *);
> >
>
>
