Commit 3f41b778 authored Oct 09, 2019 by Arnaldo Carvalho de Melo

perf trace: Add a strtoul() method to 'struct syscall_arg_fmt'

This will go from a string to a number, so that filter expressions can
be constructed with strings and then, before applying the tracepoint
filters (or eBPF, in the future) we can map those strings to numbers.

The first one will be for 'msr' tracepoint arguments, but real quickly
we will be able to reuse all strarrays for that.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-wgqq48agcgr95b8dmn6fygtr@git.kernel.org

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent d4097f19

tools/perf/builtin-trace.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -86,8 +86,12 @@
		# define F_LINUX_SPECIFIC_BASE 1024
		#endif

		/*
		* strtoul: Go from a string to a value, i.e. for msr: MSR_FS_BASE to 0xc0000100
		*/
		struct syscall_arg_fmt {
		size_t (scnprintf)(char bf, size_t size, struct syscall_arg *arg);
		bool (strtoul)(char bf, size_t size, struct syscall_arg arg, u64 val);
		unsigned long (mask_val)(struct syscall_arg arg, unsigned long val);
		void *parm;
		const char *name;
		@@ -1543,8 +1547,10 @@ syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field
		} else {
		struct syscall_arg_fmt *fmt = syscall_arg_fmt__find_by_name(field->name);

		if (fmt)
		if (fmt) {
		arg->scnprintf = fmt->scnprintf;
		arg->strtoul = fmt->strtoul;
		}
		}
		}

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