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authorTom Zanussi <tzanussi@gmail.com>2009-11-25 01:15:50 -0600
committerIngo Molnar <mingo@elte.hu>2009-11-28 10:04:27 +0100
commitd1b93772be78486397693fc39d3ddea3fda90105 (patch)
treefc4387cf44de336e655d03ee488a83cadde22e04 /tools/perf/Documentation/perf-trace.txt
parentbcefe12eff5dca6fdfa94ed85e5bee66380d5cd9 (diff)
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perf trace: Add interface to access perf data from Perl handlers
The Perl scripting support for perf trace allows most of a trace event's data to be accessed directly as handler arguments, but not all of it e.g. the less common fields aren't passed in. To give scripts access to the other fields and/or any other data or metadata in the main perf executable that might be useful, a way to access the C data in perf from Perl is needed; this patch uses the Perl XS facility to do it for the common_xxx event fields not passed to handler functions. Context.pm exports three functions to Perl scripts that access fields for the current event by calling back into perf: common_pc(), common_flags() and common_lock_depth(). Support for common_flags() field values was added to Core.pm and a script used to sanity check these and other basic scripting features, check-perf-trace.pl, was also added. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259133352-23685-6-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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