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| author |   Dominique Martinet <dominique.martinet@cea.fr> | 2014-01-17 18:31:00 +0100 |
|---|---|---|
| committer |   Eric Van Hensbergen <ericvh@gmail.com> | 2014-03-25 16:37:59 -0500 |
| commit | 2b6e72ed747f68a038df616efd86744b3644d694 (patch) | |
| tree | d781427484432608a74ccc44fd4a7a3296751f23 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | Linus 3.14-rc1 (diff) | |
| download | linux-dev-2b6e72ed747f68a038df616efd86744b3644d694.tar.xz linux-dev-2b6e72ed747f68a038df616efd86744b3644d694.zip | |
9P: Add memory barriers to protect request fields over cb/rpc threads handoff
We need barriers to guarantee this pattern works as intended:
[w] req->rc, 1 [r] req->status, 1
wmb rmb
[w] req->status, 1 [r] req->rc
Where the wmb ensures that rc gets written before status,
and the rmb ensures that if you observe status == 1, rc is the new value.
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions