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mm: tracing: Export enums in tracepoints to user space 

The enums used in tracepoints with __print_symbolic() have their
names shown in the tracepoint format files and not their values.
This makes it difficult for user space tools to convert the binary
data to the strings as user space does not know what those enums
are about.

By having them use TRACE_DEFINE_ENUM(), the names of the enums will
be mapped to the values and shown to user space.

Link: http://lkml.kernel.org/r/20150403013802.220157513@goodmis.org

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-03-27 16:48:57 -04:00 committed by Steven Rostedt
parent f0a91b3caa
commit 190f0b76ca
1 changed files with 32 additions and 10 deletions
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42
include/trace/events/migrate.h
View File

@ -7,18 +7,40 @@
#include <linux/tracepoint.h>
#define MIGRATE_MODE \
{MIGRATE_ASYNC, "MIGRATE_ASYNC"}, \
{MIGRATE_SYNC_LIGHT, "MIGRATE_SYNC_LIGHT"}, \
{MIGRATE_SYNC, "MIGRATE_SYNC"}
EM( MIGRATE_ASYNC, "MIGRATE_ASYNC") \
EM( MIGRATE_SYNC_LIGHT, "MIGRATE_SYNC_LIGHT") \
EMe(MIGRATE_SYNC, "MIGRATE_SYNC")
#define MIGRATE_REASON \
{MR_COMPACTION, "compaction"}, \
{MR_MEMORY_FAILURE, "memory_failure"}, \
{MR_MEMORY_HOTPLUG, "memory_hotplug"}, \
{MR_SYSCALL, "syscall_or_cpuset"}, \
{MR_MEMPOLICY_MBIND, "mempolicy_mbind"}, \
{MR_NUMA_MISPLACED, "numa_misplaced"}, \
{MR_CMA, "cma"}
EM( MR_COMPACTION, "compaction") \
EM( MR_MEMORY_FAILURE, "memory_failure") \
EM( MR_MEMORY_HOTPLUG, "memory_hotplug") \
EM( MR_SYSCALL, "syscall_or_cpuset") \
EM( MR_MEMPOLICY_MBIND, "mempolicy_mbind") \
EM( MR_NUMA_MISPLACED, "numa_misplaced") \
EMe(MR_CMA, "cma")
/*
* First define the enums in the above macros to be exported to userspace
* via TRACE_DEFINE_ENUM().
*/
#undef EM
#undef EMe
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define EMe(a, b) TRACE_DEFINE_ENUM(a);
MIGRATE_MODE
MIGRATE_REASON
/*
* Now redefine the EM() and EMe() macros to map the enums to the strings
* that will be printed in the output.
*/
#undef EM
#undef EMe
#define EM(a, b) {a, b},
#define EMe(a, b) {a, b}
TRACE_EVENT(mm_migrate_pages,