linux-kernel - [PATCH] virtio_balloon: add array of stat names

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Date:   Fri, 13 Apr 2018 16:44:05 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>,
        Jonathan Helman <jonathan.helman@...cle.com>,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH] virtio_balloon: add array of stat names

Jason Wang points out that it's vary 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.

Let's add an array of reasonably readable names.

Fixes: 6c64fe7f2 ("virtio_balloon: export hugetlb page allocation counts")
Cc: Jason Wang <jasowang@...hat.com>
Cc: Jonathan Helman <jonathan.helman@...cle.com>,
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/uapi/linux/virtio_balloon.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index 9e02137..1477c17 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h
@@ -64,6 +64,21 @@ struct virtio_balloon_config {
 #define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page allocation failures */
 #define VIRTIO_BALLOON_S_NR       10
 
+#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
+	VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
+	VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \
+	VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \
+	VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \
+	VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \
+	VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \
+	VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \
+	VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
+	VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
+	VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \
+}
+
+#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")
+
 /*
  * Memory statistics structure.
  * Driver fills an array of these structures and passes to device.
-- 
MST