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Re: [Qemu-devel] [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/
From: |
Li, Liang Z |
Subject: |
Re: [Qemu-devel] [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process |
Date: |
Thu, 28 Jul 2016 03:48:16 +0000 |
> > +/*
> > + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap
> > + * to prevent a very large page bitmap, there are two reasons for this:
> > + * 1) to save memory.
> > + * 2) allocate a large bitmap may fail.
> > + *
> > + * The actual limit of pfn is determined by:
> > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT);
> > + *
> > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will
> > +scan
> > + * the page list and send the PFNs with several times. To reduce the
> > + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT
> > +should
> > + * be set with a value which can cover most cases.
> > + */
> > +#define VIRTIO_BALLOON_PFNS_LIMIT ((32 * (1ULL << 30)) >>
> PAGE_SHIFT)
> > +/* 32GB */
> > +
> > static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES;
> > module_param(oom_pages, int, S_IRUSR | S_IWUSR);
> > MODULE_PARM_DESC(oom_pages, "pages to free on OOM");
> >
> > +extern unsigned long get_max_pfn(void);
> > +
>
> Please just include the correct header. No need for this hackery.
>
Will change. Thanks!
Liang
[Qemu-devel] [PATCH v2 repost 5/7] virtio-balloon: define feature bit and head for misc virt queue, Liang Li, 2016/07/26
[Qemu-devel] [PATCH v2 repost 6/7] mm: add the related functions to get free page info, Liang Li, 2016/07/26
Re: [Qemu-devel] [PATCH v2 repost 6/7] mm: add the related functions to get free page info, Li, Liang Z, 2016/07/27
Re: [Qemu-devel] [PATCH v2 repost 6/7] mm: add the related functions to get free page info, Michael S. Tsirkin, 2016/07/27
Re: [Qemu-devel] [PATCH v2 repost 6/7] mm: add the related functions to get free page info, Michael S. Tsirkin, 2016/07/27