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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2018-04-27 17:23:12 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2018-05-11 16:43:05 +0100 |
| commit | 31be8a2a97ecba7d31a82932286489cac318e9e9 (patch) | |
| tree | fda46bdc3f416a03f950e61621a0397e46665b5f /qapi | |
| parent | dd577a26ff03b6829721b1ffbbf9e7c411b72378 (diff) | |
| download | qemu-31be8a2a97ecba7d31a82932286489cac318e9e9.zip qemu-31be8a2a97ecba7d31a82932286489cac318e9e9.tar.gz qemu-31be8a2a97ecba7d31a82932286489cac318e9e9.tar.bz2 | |
block/file-posix: add x-check-page-cache=on|off option
mincore(2) checks whether pages are resident. Use it to verify that
page cache has been dropped.
You can trigger a verification failure by mmapping the image file from
another process that loads a byte from a page, forcing it to become
resident. bdrv_co_invalidate_cache() will fail while that process is
alive.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20180427162312.18583-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/block-core.json | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json index c50517b..21c3470 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2530,6 +2530,10 @@ # @locking: whether to enable file locking. If set to 'auto', only enable # when Open File Descriptor (OFD) locking API is available # (default: auto, since 2.10) +# @x-check-cache-dropped: whether to check that page cache was dropped on live +# migration. May cause noticeable delays if the image +# file is large, do not use in production. +# (default: off) (since: 2.13) # # Since: 2.9 ## @@ -2537,7 +2541,8 @@ 'data': { 'filename': 'str', '*pr-manager': 'str', '*locking': 'OnOffAuto', - '*aio': 'BlockdevAioOptions' } } + '*aio': 'BlockdevAioOptions', + '*x-check-cache-dropped': 'bool' } } ## # @BlockdevOptionsNull: |