From: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx> Hi, This patchset adds some useful new functions to the hist trigger code: a snapshot action and an onchange handler. In order to make it easier to add these and in the process make the code more generic, I separated the code into explicit 'handlers' and 'actions', handlers being things like 'onmax' and 'onchange', and 'actions' being things like 'take a snapshot' or 'save some fields'. The first few patches do that basic refactoring, which make it easier to add the subsequent changes that arbitrarily combine actions and handlers. The fourth patch adds a 'conditional snapshot' capability that via a new tracing_snaphot_cond() function extends the existing snapshot code. It allows the caller to associate some user data with the snapshot that can be checked and saved in an update() callback whose return value determines whether the snapshot should be taken or not. The remaining patches finally add the new snapshot action and onchange handler functionality - please see those patches for details and some examples. Thanks, Tom The following changes since commit 591a033dc17ff6f684b6b6d1d7426e22d178194f: tracing: Use match_string() instead of open coding it in trace_set_options() (2018-06-05 16:19:39 -0400) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git ftrace/hist-snapshot-onchange-v1 Tom Zanussi (7): tracing: Refactor hist trigger action code tracing: Split up onmatch action data tracing: Generalize hist trigger onmax and save action tracing: Add conditional snapshot tracing: Move hist trigger key printing into a separate function tracing: Add snapshot action tracing: Add hist trigger onchange() handler Documentation/trace/histogram.txt | 206 ++++++++ kernel/trace/trace.c | 155 +++++- kernel/trace/trace.h | 58 ++- kernel/trace/trace_events_hist.c | 982 ++++++++++++++++++++++++++---------- kernel/trace/trace_events_trigger.c | 2 +- kernel/trace/trace_sched_wakeup.c | 2 +- 6 files changed, 1133 insertions(+), 272 deletions(-) -- 2.14.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
