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virtio_balloon: return the amount of freed memory from leak_balloon()

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This value would be useful in the next patch to provide the amount of
the freed memory for OOM killer.

Signed-off-by: Raushaniya Maksudova <rmaksudova@parallels.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Raushaniya Maksudova 2014-11-10 09:35:29 +10:30 committed by Rusty Russell
parent 46652a861b
commit 1fd9c67203
1 changed files with 4 additions and 1 deletions
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5
drivers/virtio/virtio_balloon.c
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@ -168,8 +168,9 @@ static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
}
}
static void leak_balloon(struct virtio_balloon *vb, size_t num)
static unsigned leak_balloon(struct virtio_balloon *vb, size_t num)
{
unsigned num_freed_pages;
struct page *page;
struct balloon_dev_info *vb_dev_info = &vb->vb_dev_info;
@ -186,6 +187,7 @@ static void leak_balloon(struct virtio_balloon *vb, size_t num)
vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE;
}
num_freed_pages = vb->num_pfns;
/*
* Note that if
* virtio_has_feature(vdev, VIRTIO_BALLOON_F_MUST_TELL_HOST);
@ -195,6 +197,7 @@ static void leak_balloon(struct virtio_balloon *vb, size_t num)
tell_host(vb, vb->deflate_vq);
mutex_unlock(&vb->balloon_lock);
release_pages_by_pfn(vb->pfns, vb->num_pfns);
return num_freed_pages;
}
static inline void update_stat(struct virtio_balloon *vb, int idx,