File 0156-qcow2-Increase-the-default-upper-li.patch of Package qemu.13117

From 6c398b21e51307634465acb305782ab25d771bd7 Mon Sep 17 00:00:00 2001
From: Leonid Bloch <lbloch@janustech.com>
Date: Wed, 26 Sep 2018 19:04:44 +0300
Subject: [PATCH] qcow2: Increase the default upper limit on the L2 cache size

The upper limit on the L2 cache size is increased from 1 MB to 32 MB
on Linux platforms, and to 8 MB on other platforms (this difference is
caused by the ability to set intervals for cache cleaning on Linux
platforms only).

This is done in order to allow default full coverage with the L2 cache
for images of up to 256 GB in size (was 8 GB). Note, that only the
needed amount to cover the full image is allocated. The value which is
changed here is just the upper limit on the L2 cache size, beyond which
it will not grow, even if the size of the image will require it to.

Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 80668d0fb735f0839a46278a7d42116089b82816)
[LM: BSC#1139926]
Signed-off-by: Lin Ma <lma@suse.com>
---
 block/qcow2.h        |  6 +++++-
 docs/qcow2-cache.txt | 15 +++++++++------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/block/qcow2.h b/block/qcow2.h
index f49c6ea1be..1927c9002f 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -74,7 +74,11 @@
 /* Must be at least 4 to cover all cases of refcount table growth */
 #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */
 
-#define DEFAULT_L2_CACHE_MAX_SIZE S_1MiB
+#ifdef CONFIG_LINUX
+#define DEFAULT_L2_CACHE_MAX_SIZE S_32MiB
+#else
+#define DEFAULT_L2_CACHE_MAX_SIZE S_8MiB
+#endif
 
 #define DEFAULT_CLUSTER_SIZE S_64KiB
 
diff --git a/docs/qcow2-cache.txt b/docs/qcow2-cache.txt
index b3be6c0521..cfe014b0c7 100644
--- a/docs/qcow2-cache.txt
+++ b/docs/qcow2-cache.txt
@@ -125,12 +125,15 @@ There are a few things that need to be taken into account:
  - Both caches must have a size that is a multiple of the cluster
    size.
 
- - The maximum L2 cache size is 1 MB by default (enough for full coverage
-   of 8 GB images, with the default cluster size). This value can be
-   modified using the "l2-cache-size" option. QEMU will not use more memory
-   than needed to hold all of the image's L2 tables, regardless of this max.
-   value. The minimal L2 cache size is 2 clusters (or 2 cache entries, see
-   below).
+ - The maximum L2 cache size is 32 MB by default on Linux platforms (enough
+   for full coverage of 256 GB images, with the default cluster size). This
+   value can be modified using the "l2-cache-size" option. QEMU will not use
+   more memory than needed to hold all of the image's L2 tables, regardless
+   of this max. value.
+   On non-Linux platforms the maximal value is smaller by default (8 MB) and
+   this difference stems from the fact that on Linux the cache can be cleared
+   periodically if needed, using the "cache-clean-interval" option (see below).
+   The minimal L2 cache size is 2 clusters (or 2 cache entries, see below).
 
  - The default (and minimum) refcount cache size is 4 clusters.