perf probe: Use the last field name as the argument name
Set the last field name to the argument name when the argument is refering a data-structure member. e.g. ./perf probe --add 'vfs_read file->f_mode' Add new event: probe:vfs_read (on vfs_read with f_mode=file->f_mode) This probe records file->f_mode, but the argument name becomes "f_mode". This enables perf-trace command to parse trace event format correctly. Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20100412171700.3790.72961.stgit@localhost6.localdomain6> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -87,7 +87,7 @@ Each probe argument follows below syntax.
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[NAME=]LOCALVAR|$retval|%REG|@SYMBOL
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'NAME' specifies the name of this argument (optional). You can use the name of local variable, local data structure member (e.g. var->field, var.field2), or kprobe-tracer argument format (e.g. $retval, %ax, etc).
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'NAME' specifies the name of this argument (optional). You can use the name of local variable, local data structure member (e.g. var->field, var.field2), or kprobe-tracer argument format (e.g. $retval, %ax, etc). Note that the name of this argument will be set as the last member name if you specify a local data structure member (e.g. field2 for 'var->field1.field2'.)
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LINE SYNTAX
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-----------
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@ -481,6 +481,10 @@ static void parse_perf_probe_arg(const char *str, struct perf_probe_arg *arg)
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} while (tmp);
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(*fieldp)->name = xstrdup(str);
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pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
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/* If no name is specified, set the last field name */
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if (!arg->name)
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arg->name = xstrdup((*fieldp)->name);
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}
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/* Parse perf-probe event command */
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