perf trace beauty: Allow syscalls to mask an argument before considering it (496fd346) · Commits · 戴 / test

Take mount's 'flags' arg, to cope with this semantic, as defined in do_mount in fs/namespace.c: /* * Pre-0.97 versions of mount() didn't have a flags word. When the * flags word was introduced its top half was required to have the * magic value 0xC0ED, and this remained so until 2.4.0-test9. * Therefore, if this magic number is present, it carries no * information and must be discarded. */ We need to mask this arg, and then see if it is zero, when we simply don't print the arg name and value. The next patch will use this for mount's 'flag' arg. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Benjamin Peterson <benjamin@python.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-btue14k5jemayuykfrwsnh85@git.kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

+19 −0

Original line number	Diff line number	Diff line
		@@ -614,6 +614,7 @@ static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,

		struct syscall_arg_fmt {
		size_t (scnprintf)(char bf, size_t size, struct syscall_arg *arg);
		unsigned long (mask_val)(struct syscall_arg arg, unsigned long val);
		void *parm;
		const char *name;
		bool show_zero;
		@@ -1487,6 +1488,19 @@ static size_t syscall__scnprintf_name(struct syscall sc, char bf, size_t size,
		return scnprintf(bf, size, "arg%d: ", arg->idx);
		}

		/*
		* Check if the value is in fact zero, i.e. mask whatever needs masking, such
		* as mount 'flags' argument that needs ignoring some magic flag, see comment
		* in tools/perf/trace/beauty/mount_flags.c
		*/
		static unsigned long syscall__mask_val(struct syscall sc, struct syscall_arg arg, unsigned long val)
		{
		if (sc->arg_fmt && sc->arg_fmt[arg->idx].mask_val)
		return sc->arg_fmt[arg->idx].mask_val(arg, val);

		return val;
		}

		static size_t syscall__scnprintf_val(struct syscall sc, char bf, size_t size,
		struct syscall_arg *arg, unsigned long val)
		{
		@@ -1535,6 +1549,11 @@ static size_t syscall__scnprintf_args(struct syscall sc, char bf, size_t size,
		continue;

		val = syscall_arg__val(&arg, arg.idx);
		/*
		* Some syscall args need some mask, most don't and
		* return val untouched.
		*/
		val = syscall__mask_val(sc, &arg, val);

		/*
		* Suppress this argument if its value is zero and

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