From a3bca91f2fe54af502deaf277dd5ac0e18bffde4 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 6 Apr 2016 12:51:33 -0300 Subject: [PATCH] perf trace: Beautify sched_setscheduler 'policy' argument $ trace -e sched_setscheduler chrt -f 1 usleep 1 chrt: failed to set pid 0's policy: Operation not permitted 0.005 ( 0.005 ms): chrt/19189 sched_setscheduler(policy: FIFO, param: 0x7ffec5273d70) = -1 EPERM Operation not permitted $ Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-i5vlo5n5jv0amt8bkyicmdxh@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 4 ++++ tools/perf/trace/beauty/sched_policy.c | 44 ++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+) create mode 100644 tools/perf/trace/beauty/sched_policy.c diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index d309f45..c283153 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -1073,6 +1073,8 @@ static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size, .arg_scnprintf = { [arg] = SCA_STRARRAY, }, \ .arg_parm = { [arg] = &strarray__##array, } +#include "trace/beauty/sched_policy.c" + static struct syscall_fmt { const char *name; const char *alias; @@ -1304,6 +1306,8 @@ static struct syscall_fmt { .arg_scnprintf = { [1] = SCA_SIGNUM, /* sig */ }, }, { .name = "rt_tgsigqueueinfo", .errmsg = true, .arg_scnprintf = { [2] = SCA_SIGNUM, /* sig */ }, }, + { .name = "sched_setscheduler", .errmsg = true, + .arg_scnprintf = { [1] = SCA_SCHED_POLICY, /* policy */ }, }, { .name = "seccomp", .errmsg = true, .arg_scnprintf = { [0] = SCA_SECCOMP_OP, /* op */ [1] = SCA_SECCOMP_FLAGS, /* flags */ }, }, diff --git a/tools/perf/trace/beauty/sched_policy.c b/tools/perf/trace/beauty/sched_policy.c new file mode 100644 index 0000000..c205bc6 --- /dev/null +++ b/tools/perf/trace/beauty/sched_policy.c @@ -0,0 +1,44 @@ +#include + +/* + * Not defined anywhere else, probably, just to make sure we + * catch future flags + */ +#define SCHED_POLICY_MASK 0xff + +#ifndef SCHED_DEADLINE +#define SCHED_DEADLINE 6 +#endif + +static size_t syscall_arg__scnprintf_sched_policy(char *bf, size_t size, + struct syscall_arg *arg) +{ + const char *policies[] = { + "NORMAL", "FIFO", "RR", "BATCH", "ISO", "IDLE", "DEADLINE", + }; + size_t printed; + int policy = arg->val, + flags = policy & ~SCHED_POLICY_MASK; + + policy &= SCHED_POLICY_MASK; + if (policy <= SCHED_DEADLINE) + printed = scnprintf(bf, size, "%s", policies[policy]); + else + printed = scnprintf(bf, size, "%#x", policy); + +#define P_POLICY_FLAG(n) \ + if (flags & SCHED_##n) { \ + printed += scnprintf(bf + printed, size - printed, "|%s", #n); \ + flags &= ~SCHED_##n; \ + } + + P_POLICY_FLAG(RESET_ON_FORK); +#undef P_POLICY_FLAG + + if (flags) + printed += scnprintf(bf + printed, size - printed, "|%#x", flags); + + return printed; +} + +#define SCA_SCHED_POLICY syscall_arg__scnprintf_sched_policy -- 2.7.4