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| author | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2022-10-20 00:31:56 +0900 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-12-09 23:48:05 -0500 |
| commit | 8c2b99790196d34a58a2b00a4c9862d2de3af3e2 (patch) | |
| tree | 815159fdc30f23d73a990787b219061c8cd71a42 /Documentation/trace | |
| parent | ccf47f5cc4cebdba7444cf1c04fc1b02d4b3cd15 (diff) | |
| download | lwn-8c2b99790196d34a58a2b00a4c9862d2de3af3e2.tar.gz lwn-8c2b99790196d34a58a2b00a4c9862d2de3af3e2.zip | |
tracing: docs: Update histogram doc for .percent/.graph and 'nohitcount'
Update histogram document for .percent/.graph suffixes and 'nohitcount'
option.
Link: https://lore.kernel.org/linux-trace-kernel/166610815604.56030.4124933216911828519.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Tested-by: Tom Zanussi <zanussi@kernel.org>
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/histogram.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst index 87bd772836c0..f95459aa984f 100644 --- a/Documentation/trace/histogram.rst +++ b/Documentation/trace/histogram.rst @@ -25,7 +25,7 @@ Documentation written by Tom Zanussi hist:keys=<field1[,field2,...]>[:values=<field1[,field2,...]>] [:sort=<field1[,field2,...]>][:size=#entries][:pause][:continue] - [:clear][:name=histname1][:<handler>.<action>] [if <filter>] + [:clear][:name=histname1][:nohitcount][:<handler>.<action>] [if <filter>] When a matching event is hit, an entry is added to a hash table using the key(s) and value(s) named. Keys and values correspond to @@ -79,6 +79,8 @@ Documentation written by Tom Zanussi .log2 display log2 value rather than raw number .buckets=size display grouping of values rather than raw number .usecs display a common_timestamp in microseconds + .percent display a number of percentage value + .graph display a bar-graph of a value ============= ================================================= Note that in general the semantics of a given field aren't @@ -137,6 +139,12 @@ Documentation written by Tom Zanussi existing trigger, rather than via the '>' operator, which will cause the trigger to be removed through truncation. + The 'nohitcount' (or NOHC) parameter will suppress display of + raw hitcount in the histogram. This option requires at least one + value field which is not a 'raw hitcount'. For example, + 'hist:...:vals=hitcount:nohitcount' is rejected, but + 'hist:...:vals=hitcount.percent:nohitcount' is OK. + - enable_hist/disable_hist The enable_hist and disable_hist triggers can be used to have one |