1023
64%
master: 66%

Ran 21 Jun 2017 01:50AM UTC

Jobs 1

Files 217

Run time 12s

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Build # 1023

Build Type

push

travis-ci

Committed by

avagin

Commit Message

lazy-pages: use random read from page-pipe instead of splitting it

For the remote lazy pages case, to access pages in the middle of a pipe we
are splitting the page_pipe_buffers and iovecs and use splice() to move the
data between the underlying pipes. After the splits we get page_pipe_buffer
with single iovec that can be used to splice() the data further into the
socket.
This patch replaces the splitting and splicing with use of a helper pipe
and tee(). We tee() the pages from beginning of the pipe up to the last
requested page into a helper pipe, sink the unneeded head part into
/dev/null and we get the requested pages ready for splice() into the
socket.
This allows lazy-pages daemon to request the same page several time, which
is required to properly support fork() after the restore.
As added bonus we simplify the code and reduce amount of pipes that live in
the system.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

Run Details

19801 of 30639 relevant lines covered (64.63%)

127171.05 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	1023.1 (TR_ARCH=local GCOV=1)	21 Jun 2017 01:50AM UTC	0	64.63	Travis Job 1023.1

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