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| author | Peter Maydell <peter.maydell@linaro.org> | 2015-01-16 10:16:14 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2015-01-16 10:16:14 +0000 |
| commit | e68cba36360a2ab5bf0576b66df4d0eb0d822f8d (patch) | |
| tree | 933ecff5cc8e380fe38693dc0cca2d7b8e479dfc /docs/xbzrle.txt | |
| parent | df58887b20fab8fe8a6dcca4db30cd4e4077d53a (diff) | |
| parent | ea987c2c21d4326bb58ee28f6888fdcf8fbda067 (diff) | |
Merge remote-tracking branch 'remotes/amit-migration/tags/mig-2.3-1' into staging
A set of patches collected over the holidays. Mix of optimizations and
fixes.
# gpg: Signature made Fri 16 Jan 2015 07:42:00 GMT using RSA key ID 854083B6
# gpg: Good signature from "Amit Shah <amit@amitshah.net>"
# gpg: aka "Amit Shah <amit@kernel.org>"
# gpg: aka "Amit Shah <amitshah@gmx.net>"
* remotes/amit-migration/tags/mig-2.3-1:
vmstate: type-check sub-arrays
migration_cancel: shutdown migration socket
Handle bi-directional communication for fd migration
socket shutdown
Tests: QEMUSizedBuffer/QEMUBuffer
QEMUSizedBuffer: only free qsb that qemu_bufopen allocated
xbzrle: rebuild the cache_is_cached function
xbzrle: optimize XBZRLE to decrease the cache misses
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs/xbzrle.txt')
| -rw-r--r-- | docs/xbzrle.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/xbzrle.txt b/docs/xbzrle.txt index cc3a26a91d..52c8511a4c 100644 --- a/docs/xbzrle.txt +++ b/docs/xbzrle.txt @@ -71,6 +71,14 @@ encoded buffer: encoded length 24 e9 07 0f 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 03 01 67 01 01 69 +Cache update strategy +===================== +Keeping the hot pages in the cache is effective for decreased cache +misses. XBZRLE uses a counter as the age of each page. The counter will +increase after each ram dirty bitmap sync. When a cache conflict is +detected, XBZRLE will only evict pages in the cache that are older than +a threshold. + Usage ====================== 1. Verify the destination QEMU version is able to decode the new format. |