diff options
| author | Don Brady <[email protected]> | 2019-06-22 16:51:46 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2019-06-22 16:51:46 -0700 |
| commit | 186898bbb580a830c02d994e961d717f7cf5dcca (patch) | |
| tree | 3af5af5af4d7bed1bafb671c86f3876f01e0dc57 /include/sys/txg.h | |
| parent | cb9e5b7e84654a8c7dba0f9a0d1227f3c8fa1012 (diff) | |
OpenZFS 9425 - channel programs can be interrupted
Problem Statement
=================
ZFS Channel program scripts currently require a timeout, so that hung or
long-running scripts return a timeout error instead of causing ZFS to get
wedged. This limit can currently be set up to 100 million Lua instructions.
Even with a limit in place, it would be desirable to have a sys admin
(support engineer) be able to cancel a script that is taking a long time.
Proposed Solution
=================
Make it possible to abort a channel program by sending an interrupt signal.In
the underlying txg_wait_sync function, switch the cv_wait to a cv_wait_sig to
catch the signal. Once a signal is encountered, the dsl_sync_task function can
install a Lua hook that will get called before the Lua interpreter executes a
new line of code. The dsl_sync_task can resume with a standard txg_wait_sync
call and wait for the txg to complete. Meanwhile, the hook will abort the
script and indicate that the channel program was canceled. The kernel returns
a EINTR to indicate that the channel program run was canceled.
Porting notes: Added missing return value from cv_wait_sig()
Authored by: Don Brady <[email protected]>
Reviewed by: Sebastien Roy <[email protected]>
Reviewed by: Serapheim Dimitropoulos <[email protected]>
Reviewed by: Matt Ahrens <[email protected]>
Reviewed by: Sara Hartse <[email protected]>
Reviewed by: Brian Behlendorf <[email protected]>
Approved by: Robert Mustacchi <[email protected]>
Ported-by: Don Brady <[email protected]>
Signed-off-by: Don Brady <[email protected]>
OpenZFS-issue: https://www.illumos.org/issues/9425
OpenZFS-commit: https://github.com/illumos/illumos-gate/commit/d0cb1fb926
Closes #8904
Diffstat (limited to 'include/sys/txg.h')
| -rw-r--r-- | include/sys/txg.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/sys/txg.h b/include/sys/txg.h index 760d5208b..260a3b43c 100644 --- a/include/sys/txg.h +++ b/include/sys/txg.h @@ -88,6 +88,11 @@ extern void txg_kick(struct dsl_pool *dp); extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg); /* + * Wait as above. Returns true if the thread was signaled while waiting. + */ +extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg); + +/* * Wait until the given transaction group, or one after it, is * the open transaction group. Try to make this happen as soon * as possible (eg. kick off any necessary syncs immediately) when |