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Commit e1217c02 authored by Suren Baghdasaryan's avatar Suren Baghdasaryan
Browse files

lmkd: Add ability to trace lmkd kills 



(cherry pick from commit c7135599)

For tracing lmkd kills inside kernel it is useful to have traces
indicating when and which process lmkd is killing. By default the
tracing is disabled.

Bug: 63631020
Test: alloc-stress

Change-Id: I3ceb2bde0c292eec55855cb4535927f3b4c5d08b
Merged-In: I3ceb2bde0c292eec55855cb4535927f3b4c5d08b
Signed-off-by: default avatarSuren Baghdasaryan <surenb@google.com>
parent b93764db

lmkd/Android.bp

+8 −0
Original line number Diff line number Diff line
@@ -10,4 +10,12 @@ cc_binary { 
    cflags: ["-Werror"],



    init_rc: ["lmkd.rc"],



    product_variables: {

        debuggable: {

            cflags: [

                "-DLMKD_TRACE_KILLS"

            ],

        },

    },

}

lmkd/lmkd.c

+23 −0
Original line number Diff line number Diff line
@@ -37,6 +37,25 @@ 
#include <log/log.h>

#include <processgroup/processgroup.h>



/*

 * Define LMKD_TRACE_KILLS to record lmkd kills in kernel traces

 * to profile and correlate with OOM kills

 */

#ifdef LMKD_TRACE_KILLS



#define ATRACE_TAG ATRACE_TAG_ALWAYS

#include <cutils/trace.h>



#define TRACE_KILL_START(pid) ATRACE_INT(__FUNCTION__, pid);

#define TRACE_KILL_END()      ATRACE_INT(__FUNCTION__, 0);



#else /* LMKD_TRACE_KILLS */



#define TRACE_KILL_START(pid)

#define TRACE_KILL_END()



#endif /* LMKD_TRACE_KILLS */



#ifndef __unused

#define __unused __attribute__((__unused__))

#endif
@@ -638,6 +657,8 @@ static int kill_one_process(struct proc* procp, int min_score_adj, 
        return -1;

    }



    TRACE_KILL_START(pid);



    r = kill(pid, SIGKILL);

    ALOGI(

        "Killing '%s' (%d), uid %d, adj %d\n"
@@ -646,6 +667,8 @@ static int kill_one_process(struct proc* procp, int min_score_adj, 
        level_name[level], min_score_adj);

    pid_remove(pid);



    TRACE_KILL_END();



    if (r) {

        ALOGE("kill(%d): errno=%d", pid, errno);

        return -1;