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b400003250
Jason Wang points out that it's very hard for users to build an array of stat names. The naive thing is to use VIRTIO_BALLOON_S_NR but that breaks if we add more stats - as done e.g. recently by commit6c64fe7f2("virtio_balloon: export hugetlb page allocation counts"). Let's add an array of reasonably readable names. Fixes:6c64fe7f2("virtio_balloon: export hugetlb page allocation counts") Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Jonathan Helman <jonathan.helman@oracle.com>
104 lines
4.5 KiB
C
104 lines
4.5 KiB
C
#ifndef _LINUX_VIRTIO_BALLOON_H
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#define _LINUX_VIRTIO_BALLOON_H
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/* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE. */
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#include <linux/types.h>
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#include <linux/virtio_types.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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/* The feature bitmap for virtio balloon */
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#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
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#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
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#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
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/* Size of a PFN in the balloon interface. */
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#define VIRTIO_BALLOON_PFN_SHIFT 12
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struct virtio_balloon_config {
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/* Number of pages host wants Guest to give up. */
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__u32 num_pages;
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/* Number of pages we've actually got in balloon. */
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__u32 actual;
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};
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#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
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#define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
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#define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */
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#define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */
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#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
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#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
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#define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */
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#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
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#define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */
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#define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */
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#define VIRTIO_BALLOON_S_NR 10
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#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
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VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
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VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \
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VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \
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VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \
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VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \
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VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \
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VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \
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VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
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VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
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VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \
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}
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#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")
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/*
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* Memory statistics structure.
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* Driver fills an array of these structures and passes to device.
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*
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* NOTE: fields are laid out in a way that would make compiler add padding
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* between and after fields, so we have to use compiler-specific attributes to
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* pack it, to disable this padding. This also often causes compiler to
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* generate suboptimal code.
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*
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* We maintain this statistics structure format for backwards compatibility,
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* but don't follow this example.
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*
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* If implementing a similar structure, do something like the below instead:
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* struct virtio_balloon_stat {
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* __virtio16 tag;
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* __u8 reserved[6];
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* __virtio64 val;
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* };
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*
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* In other words, add explicit reserved fields to align field and
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* structure boundaries at field size, avoiding compiler padding
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* without the packed attribute.
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*/
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struct virtio_balloon_stat {
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__virtio16 tag;
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__virtio64 val;
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} __attribute__((packed));
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#endif /* _LINUX_VIRTIO_BALLOON_H */
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