Re: vm_page_t related KBI [Was: Re: panic at vm_page_wire with

On Sat, Nov 5, 2011 at 7:13 AM, Kostik Belousov <kostikbel@gmail.com> wrote=
:
> On Fri, Nov 04, 2011 at 06:03:39PM +0200, Kostik Belousov wrote:
>
> Below is the KBI patch after vm_page_bits_t merge is done.
> Again, I did not spent time converting all in-tree consumers
> from the (potentially) loadable modules to the new KPI until it
> is agreed upon.

I like my bikeshed orange...

I would think a more canonical name would be get/set rather than
read/write, especially since these operations aren't reading and
writing the page (neither are they getting the page, but at least set
is pretty unambiguous).

Thanks,
matthew

>
> diff --git a/sys/nfsclient/nfs_bio.c b/sys/nfsclient/nfs_bio.c
> index 305c189..7264cd1 100644
> --- a/sys/nfsclient/nfs_bio.c
> +++ b/sys/nfsclient/nfs_bio.c
> @@ -128,7 +128,7 @@ nfs_getpages(struct vop_getpages_args *ap)
> =A0 =A0 =A0 =A0 * can only occur at the file EOF.
> =A0 =A0 =A0 =A0 */
> =A0 =A0 =A0 =A0VM_OBJECT_LOCK(object);
> - =A0 =A0 =A0 if (pages[ap->a_reqpage]->valid !=3D 0) {
> + =A0 =A0 =A0 if (vm_page_read_valid(pages[ap->a_reqpage]) !=3D 0) {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0for (i =3D 0; i < npages; ++i) {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (i !=3D ap->a_reqpage) =
{
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0vm_page_lo=
ck(pages[i]);
> @@ -198,16 +198,16 @@ nfs_getpages(struct vop_getpages_args *ap)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0/*
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 * Read operation filled a=
n entire page
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 */
> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 m->valid =3D VM_PAGE_BITS_A=
LL;
> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 KASSERT(m->dirty =3D=3D 0,
> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 vm_page_write_valid(m, VM_P=
AGE_BITS_ALL);
> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 KASSERT(vm_page_read_dirty(=
m) =3D=3D 0,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0("nfs_getpages: pa=
ge %p is dirty", m));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0} else if (size > toff) {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0/*
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 * Read operation filled a=
 partial page.
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 */
> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 m->valid =3D 0;
> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 vm_page_write_valid(m, 0);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0vm_page_set_valid(m, 0, si=
ze - toff);
> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 KASSERT(m->dirty =3D=3D 0,
> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 KASSERT(vm_page_read_dirty(=
m) =3D=3D 0,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0("nfs_getpages: pa=
ge %p is dirty", m));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0} else {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0/*
> diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
> index 389aea5..2f41e70 100644
> --- a/sys/vm/vm_page.c
> +++ b/sys/vm/vm_page.c
> @@ -2677,6 +2677,66 @@ vm_page_test_dirty(vm_page_t m)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0vm_page_dirty(m);
> =A0}
>
> +void
> +vm_page_lock_func(vm_page_t m, const char *file, int line)
> +{
> +
> +#if LOCK_DEBUG > 0 || defined(MUTEX_NOINLINE)
> + =A0 =A0 =A0 _mtx_lock_flags(vm_page_lockptr(m), 0, file, line);
> +#else
> + =A0 =A0 =A0 __mtx_lock(vm_page_lockptr(m), 0, file, line);
> +#endif
> +}
> +
> +void
> +vm_page_unlock_func(vm_page_t m, const char *file, int line)
> +{
> +
> +#if LOCK_DEBUG > 0 || defined(MUTEX_NOINLINE)
> + =A0 =A0 =A0 _mtx_unlock_flags(vm_page_lockptr(m), 0, file, line);
> +#else
> + =A0 =A0 =A0 __mtx_unlock(vm_page_lockptr(m), curthread, 0, file, line);
> +#endif
> +}
> +
> +int
> +vm_page_trylock_func(vm_page_t m, const char *file, int line)
> +{
> +
> + =A0 =A0 =A0 return (_mtx_trylock(vm_page_lockptr(m), 0, file, line));
> +}
> +
> +void
> +vm_page_lock_assert_func(vm_page_t m, int a, const char *file, int line)
> +{
> +
> +#ifdef INVARIANTS
> + =A0 =A0 =A0 _mtx_assert(vm_page_lockptr(m), a, file, line);
> +#endif
> +}
> +
> +vm_page_bits_t
> +vm_page_read_dirty_func(vm_page_t m)
> +{
> +
> + =A0 =A0 =A0 return (m->dirty);
> +}
> +
> +vm_page_bits_t
> +vm_page_read_valid_func(vm_page_t m)
> +{
> +
> + =A0 =A0 =A0 return (m->valid);
> +}
> +
> +void
> +vm_page_write_valid_func(vm_page_t m, vm_page_bits_t v)
> +{
> +
> + =A0 =A0 =A0 m->valid =3D v;
> +}
> +
> +
> =A0int so_zerocp_fullpage =3D 0;
>
> =A0/*
> diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
> index 7099b70..4f8f71e 100644
> --- a/sys/vm/vm_page.h
> +++ b/sys/vm/vm_page.h
> @@ -218,12 +218,50 @@ extern struct vpglocks pa_lock[];
>
> =A0#define =A0 =A0 =A0 =A0PA_LOCK_ASSERT(pa, a) =A0 mtx_assert(PA_LOCKPTR=
(pa), (a))
>
> +#ifdef KLD_MODULE
> +#define =A0 =A0 =A0 =A0vm_page_lock(m) =A0 =A0 =A0 =A0 vm_page_lock_func=
((m), LOCK_FILE, LOCK_LINE)
> +#define =A0 =A0 =A0 =A0vm_page_unlock(m) =A0 =A0 =A0 vm_page_unlock_func=
((m), LOCK_FILE, LOCK_LINE)
> +#define =A0 =A0 =A0 =A0vm_page_trylock(m) =A0 =A0 =A0vm_page_trylock_fun=
c((m), LOCK_FILE, LOCK_LINE)
> +#ifdef INVARIANTS
> +#define =A0 =A0 =A0 =A0vm_page_lock_assert(m, a) =A0 =A0 =A0 \
> + =A0 =A0vm_page_lock_assert_func((m), (a), LOCK_FILE, LOCK_LINE)
> +#else
> +#define =A0 =A0 =A0 =A0vm_page_lock_assert(m, a)
> +#endif
> +
> +#define =A0 =A0 =A0 =A0vm_page_read_dirty(m) =A0 vm_page_read_dirty_func=
((m))
> +#define =A0 =A0 =A0 =A0vm_page_read_valid(m) =A0 vm_page_read_valid_func=
((m))
> +#define =A0 =A0 =A0 =A0vm_page_write_valid(m, v) =A0 =A0 =A0 vm_page_wri=
te_valid_func((m), (v))
> +
> +#else =A0/* KLD_MODULE */
> =A0#define =A0 =A0 =A0 =A0vm_page_lockptr(m) =A0 =A0 =A0(PA_LOCKPTR(VM_PA=
GE_TO_PHYS((m))))
> =A0#define =A0 =A0 =A0 =A0vm_page_lock(m) =A0 =A0 =A0 =A0 mtx_lock(vm_pag=
e_lockptr((m)))
> =A0#define =A0 =A0 =A0 =A0vm_page_unlock(m) =A0 =A0 =A0 mtx_unlock(vm_pag=
e_lockptr((m)))
> =A0#define =A0 =A0 =A0 =A0vm_page_trylock(m) =A0 =A0 =A0mtx_trylock(vm_pa=
ge_lockptr((m)))
> =A0#define =A0 =A0 =A0 =A0vm_page_lock_assert(m, a) =A0 =A0 =A0 mtx_asser=
t(vm_page_lockptr((m)), (a))
>
> +static inline vm_page_bits_t
> +vm_page_read_dirty(vm_page_t m)
> +{
> +
> + =A0 =A0 =A0 return (m->dirty);
> +}
> +
> +static inline vm_page_bits_t
> +vm_page_read_valid(vm_page_t m)
> +{
> +
> + =A0 =A0 =A0 return (m->valid);
> +}
> +
> +static inline void
> +vm_page_write_valid(vm_page_t m, vm_page_bits_t v)
> +{
> +
> + =A0 =A0 =A0 m->valid =3D v;
> +}
> +#endif
> +
> =A0#define =A0 =A0 =A0 =A0vm_page_queue_free_mtx =A0vm_page_queue_free_lo=
ck.data
> =A0/*
> =A0* These are the flags defined for vm_page.
> @@ -403,6 +441,15 @@ void vm_page_cowfault (vm_page_t);
> =A0int vm_page_cowsetup(vm_page_t);
> =A0void vm_page_cowclear (vm_page_t);
>
> +void vm_page_lock_func(vm_page_t m, const char *file, int line);
> +void vm_page_unlock_func(vm_page_t m, const char *file, int line);
> +int vm_page_trylock_func(vm_page_t m, const char *file, int line);
> +void vm_page_lock_assert_func(vm_page_t m, int a, const char *file, int =
line);
> +
> +vm_page_bits_t vm_page_read_dirty_func(vm_page_t m);
> +vm_page_bits_t vm_page_read_valid_func(vm_page_t m);
> +void vm_page_write_valid_func(vm_page_t m, vm_page_bits_t v);
> +
> =A0#ifdef INVARIANTS
> =A0void vm_page_object_lock_assert(vm_page_t m);
> =A0#define =A0 =A0 =A0 =A0VM_PAGE_OBJECT_LOCK_ASSERT(m) =A0 vm_page_objec=
t_lock_assert(m)
>
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