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Commit d2e4e46c authored by San Mehat's avatar San Mehat
Browse files

cutils: schedpolicy: Add debug code to log sched policy transitions 



Signed-off-by: default avatarSan Mehat <san@google.com>
parent 39274417

libcutils/sched_policy.c

+37 −0
Original line number Diff line number Diff line
@@ -23,6 +23,9 @@ 
#include <errno.h>

#include <fcntl.h>



#define LOG_TAG "SchedPolicy"

#include "cutils/log.h"



#ifdef HAVE_SCHED_H



#include <sched.h>
@@ -37,6 +40,8 @@ 
  #define SCHED_BATCH 3

#endif



#define POLICY_DEBUG 1



static int __sys_supports_schedgroups = -1;



static int add_tid_to_cgroup(int tid, const char *grp_name)
@@ -155,6 +160,38 @@ int set_sched_policy(int tid, SchedPolicy policy) 
{

    initialize();



#if POLICY_DEBUG

    char statfile[64];

    char statline[1024];

    char thread_name[255];

    int fd;



    sprintf(statfile, "/proc/%d/stat", tid);

    memset(thread_name, 0, sizeof(thread_name));



    fd = open(statfile, O_RDONLY);

    if (fd >= 0) {

        int rc = read(fd, statline, 1023);

        close(fd);

        statline[rc] = 0;

        char *p = statline;

        char *q;



        for (p = statline; *p != '('; p++);

        p++;

        for (q = p; *q != ')'; q++);



        strncpy(thread_name, p, (q-p));

    }

    if (policy == SP_BACKGROUND) {

        LOGD("vvv tid %d (%s)", tid, thread_name);

    } else if (policy == SP_FOREGROUND) {

        LOGD("^^^ tid %d (%s)", tid, thread_name);

    } else {

        LOGD("??? tid %d (%s)", tid, thread_name);

    }

#endif



    if (__sys_supports_schedgroups) {

        const char *grp = NULL;