On Wed, Mar 12, 2025 at 12:57 AM Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
>
> On Tue, Mar 11, 2025 at 06:06:59PM -0600, Nico Pache wrote:
> > Update the NR_BALLOON_PAGES counter when pages are added to or
> > removed from the VMware balloon.
> >
> > Signed-off-by: Nico Pache <npache@xxxxxxxxxx>
> > ---
> > drivers/misc/vmw_balloon.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
> > index c817d8c21641..2c70b08c6fb3 100644
> > --- a/drivers/misc/vmw_balloon.c
> > +++ b/drivers/misc/vmw_balloon.c
> > @@ -673,6 +673,8 @@ static int vmballoon_alloc_page_list(struct vmballoon *b,
> >
> > vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC,
> > ctl->page_size);
> > + mod_node_page_state(page_pgdat(page), NR_BALLOON_PAGES,
> > + vmballoon_page_in_frames(ctl->page_size));
>
>
> same issue as virtio I think - this counts frames not pages.
I agree with the viritio issue since PAGE_SIZE can be larger than
VIRTIO_BALLOON_PFN_SHIFT, resulting in multiple virtio_balloon pages
for each page. I fixed that one, thanks!
For the Vmware one, the code is littered with mentions of counting in
4k or 2M but as far as I can tell from looking at the code it actually
operates in PAGE_SIZE or PMD size chunks and this count would be
correct.
Perhaps I am missing something though.
>
> > }
> >
> > if (page) {
> > @@ -915,6 +917,8 @@ static void vmballoon_release_page_list(struct list_head *page_list,
> > list_for_each_entry_safe(page, tmp, page_list, lru) {
> > list_del(&page->lru);
> > __free_pages(page, vmballoon_page_order(page_size));
> > + mod_node_page_state(page_pgdat(page), NR_BALLOON_PAGES,
> > + -vmballoon_page_in_frames(page_size));
> > }
> >
> > if (n_pages)
> > @@ -1129,7 +1133,6 @@ static void vmballoon_inflate(struct vmballoon *b)
> >
> > /* Update the balloon size */
> > atomic64_add(ctl.n_pages * page_in_frames, &b->size);
> > -
>
>
> unrelated change
Fixed, Thanks for reviewing!
>
> > vmballoon_enqueue_page_list(b, &ctl.pages, &ctl.n_pages,
> > ctl.page_size);
> >
> > --
> > 2.48.1
>
