perf tools: Asprintf like functions to format integer filter expression (93ec4ce7) · Commits · 戴 / test

char *asprintf_expr_in_ints(const char *var, size_t nints, int *ints); char *asprintf_expr_not_in_ints(const char *var, size_t nints, int *ints); Example of output formatted with those functions: # ./tp_filter 6 12 2015 asprintf_expr_in_ints: id == 6 || id == 12 || id == 2015 asprintf_expr_not_in_ints: id != 6 && id != 12 && id != 2015 # It'll be used with, for instance, perf_evsel__set_filter_in_ints(), that will be used in turn to ask the kernel to filter out all raw_syscalls:* except for the ones specified by the user via: $ perf trace -e some,list,of,syscalls Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-jt07vfp6bd8y50c05j1t7hrn@git.kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/string.c

+39 −0

Original line number	Diff line number	Diff line
		@@ -357,3 +357,42 @@ void memdup(const void src, size_t len)

		return p;
		}

		char asprintf_expr_inout_ints(const char var, bool in, size_t nints, int *ints)
		{
		/*
		* FIXME: replace this with an expression using log10() when we
		* find a suitable implementation, maybe the one in the dvb drivers...
		*
		* "%s == %d \|\| " = log10(MAXINT) * 2 + 8 chars for the operators
		*/
		size_t size = nints * 28 + 1; /* \0 */
		size_t i, printed = 0;
		char *expr = malloc(size);

		if (expr) {
		const char or_and = "\|\|", eq_neq = "==";
		char *e = expr;

		if (!in) {
		or_and = "&&";
		eq_neq = "!=";
		}

		for (i = 0; i < nints; ++i) {
		if (printed == size)
		goto out_err_overflow;

		if (i > 0)
		printed += snprintf(e + printed, size - printed, " %s ", or_and);
		printed += scnprintf(e + printed, size - printed,
		"%s %s %d", var, eq_neq, ints[i]);
		}
		}

		return expr;

		out_err_overflow:
		free(expr);
		return NULL;
		}

tools/perf/util/util.h

+12 −0

Original line number	Diff line number	Diff line
		@@ -339,4 +339,16 @@ int gzip_decompress_to_file(const char *input, int output_fd);
		int lzma_decompress_to_file(const char *input, int output_fd);
		#endif

		char asprintf_expr_inout_ints(const char var, bool in, size_t nints, int *ints);

		static inline char asprintf_expr_in_ints(const char var, size_t nints, int *ints)
		{
		return asprintf_expr_inout_ints(var, true, nints, ints);
		}

		static inline char asprintf_expr_not_in_ints(const char var, size_t nints, int *ints)
		{
		return asprintf_expr_inout_ints(var, false, nints, ints);
		}

		#endif /* GIT_COMPAT_UTIL_H */

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