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Subject[PATCH v2 0/2] enable hires timer to timeout datagram socket
Date
v1->v2:
- Cong Wang pointed out MAX_SCHEDULE_TIMEOUT wraparound, fixed the
patch 1/2 to accommodate MAX_SCHEDULE_TIMEOUT wait time
- Changed format of printing total time from float to long in
selftests patch 2/2

Hello Dave,

Resending the patch series to include netdev mailing list with a
cover letter.

I am submitting 2 patch series to enable hires timer to timeout
datagram sockets (AF_UNIX & AF_INET domain) and test code to test
timeout accuracy on these sockets.

There has been a behavior change in 4.9 kernel with refactoring of Kernel
timer wheel in 4.8. We have a use case wherein our datagram socket
application is sensitive to socket timeout including long timeouts.

One of the test runs with a timeout value of 180 seconds timed out at
190 seconds.
[root@]# ./datagram_sock_timeout 180000
datagram_sock_timeout failed: took 190.00 seconds
[root@]#
The same program when run on a 4.4 kernel would timeout more accurately and
the kernel added slack was not noticeable to user application.

Patch 1: Has core code change of enabling hires timer to timeout datagram
socket on AF_UNIX and AF_INET domain
Patch 2: Test code to report regression in timeout behavior related to
patch 1

Vallish Vaidyeshwara (2):
net: enable high resolution timer mode to timeout datagram sockets
selftests/net: add test to verify datagram socket timeout

net/core/datagram.c | 14 ++-
tools/testing/selftests/net/Makefile | 3 +-
.../testing/selftests/net/datagram_sock_timeout.c | 119 +++++++++++++++++++++
.../selftests/net/run_datagram_sock_timeout.sh | 12 +++
4 files changed, 146 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/net/datagram_sock_timeout.c
create mode 100755 tools/testing/selftests/net/run_datagram_sock_timeout.sh

--
2.7.3.AMZN

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