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tracing/histogram: Update document for KEYS_MAX size 

After commit 4f36c2d85c ("tracing: Increase tracing map KEYS_MAX size"),
'keys' supports up to three fields.

Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Cc: stable@vger.kernel.org
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20221017103806.2479139-1-zhengyejian1@huawei.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Zheng Yejian 2022-10-17 10:38:06 +00:00 committed by Jonathan Corbet
parent 9abf2313ad
commit a635beeacc
1 changed files with 1 additions and 1 deletions
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Documentation/trace/histogram.rst
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@ -39,7 +39,7 @@ Documentation written by Tom Zanussi
will use the event's kernel stacktrace as the key. The keywords will use the event's kernel stacktrace as the key. The keywords
'keys' or 'key' can be used to specify keys, and the keywords 'keys' or 'key' can be used to specify keys, and the keywords
'values', 'vals', or 'val' can be used to specify values. Compound 'values', 'vals', or 'val' can be used to specify values. Compound
keys consisting of up to two fields can be specified by the 'keys' keys consisting of up to three fields can be specified by the 'keys'
keyword. Hashing a compound key produces a unique entry in the keyword. Hashing a compound key produces a unique entry in the
table for each unique combination of component keys, and can be table for each unique combination of component keys, and can be
useful for providing more fine-grained summaries of event data. useful for providing more fine-grained summaries of event data.