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author | 2015-07-02 17:48:23 -0300 | |
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committer | 2015-07-06 10:21:46 -0300 | |
commit | 93ec4ce789995c5c58dff82193b3ec77caa8aecb (patch) | |
tree | 34b9b83e736e93b618957a8e84732ce6ff67f7ac /tools/perf/util/string.c | |
parent | Merge branch 'perf/rbtree_copy' of git://git.kernel.org/pub/scm/linux/kernel/... (diff) | |
download | linux-93ec4ce789995c5c58dff82193b3ec77caa8aecb.tar.gz linux-93ec4ce789995c5c58dff82193b3ec77caa8aecb.tar.bz2 linux-93ec4ce789995c5c58dff82193b3ec77caa8aecb.zip |
perf tools: Asprintf like functions to format integer filter expression
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>
Diffstat (limited to 'tools/perf/util/string.c')
-rw-r--r-- | tools/perf/util/string.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c index 6afd6106ceb5..fc8781de62db 100644 --- a/tools/perf/util/string.c +++ b/tools/perf/util/string.c @@ -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; +} |