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xen/balloon: Only mark a page as managed when it is released 

Only mark a page as managed when it is released back to the allocator.
This ensures that the managed page count does not get falsely increased
when a VM is running. Correspondingly change it so that pages are
marked as unmanaged after getting them from the allocator.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Ross Lagerwall 2016-12-09 17:10:22 +00:00 committed by Juergen Gross
parent 581d21a2d0
commit 709613ad2b
1 changed files with 2 additions and 4 deletions
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6
drivers/xen/balloon.c
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@ -180,7 +180,6 @@ static void __balloon_append(struct page *page)
static void balloon_append(struct page *page)
{
__balloon_append(page);
adjust_managed_page_count(page, -1);
}
/* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
@ -201,8 +200,6 @@ static struct page *balloon_retrieve(bool require_lowmem)
else
balloon_stats.balloon_low--;
adjust_managed_page_count(page, 1);
return page;
}
@ -478,7 +475,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
#endif
/* Relinquish the page back to the allocator. */
__free_reserved_page(page);
free_reserved_page(page);
}
balloon_stats.current_pages += rc;
@ -509,6 +506,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
state = BP_EAGAIN;
break;
}
adjust_managed_page_count(page, -1);
scrub_page(page);
list_add(&page->lru, &pages);
}