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Commit 9351f720 authored by Joel Fernandes's avatar Joel Fernandes
Browse files

atrace: setup saved_cmdlines_size and write only if available 



Older kernels (bullhead etc) don't have saved_cmdlines_size, check and
write only if available. Also make work on non-root by setting
permissions in rc file (thanks John Reck for suggestion).

Bug: 62375794

Change-Id: Iefffc3203afd092ffb6cf420a144b38844aaee39
Signed-off-by: default avatarJoel Fernandes <joelaf@google.com>
parent 7258088e

cmds/atrace/atrace.cpp

+4 −1
Original line number Diff line number Diff line
@@ -444,8 +444,11 @@ static bool setTraceBufferSizeKB(int size) 
// Set the default size of cmdline hashtable

static bool setCmdlineSize()

{

    if (fileExists(k_traceCmdlineSizePath)) {

        return writeStr(k_traceCmdlineSizePath, "8192");

    }

    return true;

}



// Set the clock to the best available option while tracing. Use 'boot' if it's

// available; otherwise, use 'mono'. If neither are available use 'global'.

cmds/atrace/atrace.rc

+4 −0
Original line number Diff line number Diff line
@@ -15,6 +15,8 @@ on post-fs 
    chown root shell /sys/kernel/tracing/options/overwrite

    chown root shell /sys/kernel/debug/tracing/options/print-tgid

    chown root shell /sys/kernel/tracing/options/print-tgid

    chown root shell /sys/kernel/debug/tracing/options/saved_cmdlines_size

    chown root shell /sys/kernel/tracing/options/saved_cmdlines_size

    chown root shell /sys/kernel/debug/tracing/events/sched/sched_switch/enable

    chown root shell /sys/kernel/tracing/events/sched/sched_switch/enable

    chown root shell /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable
@@ -63,6 +65,8 @@ on post-fs 
    chmod 0664 /sys/kernel/tracing/options/overwrite

    chmod 0664 /sys/kernel/debug/tracing/options/print-tgid

    chmod 0664 /sys/kernel/tracing/options/print-tgid

    chmod 0664 /sys/kernel/debug/tracing/options/saved_cmdlines_size

    chmod 0664 /sys/kernel/tracing/options/saved_cmdlines_size

    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_switch/enable

    chmod 0664 /sys/kernel/tracing/events/sched/sched_switch/enable

    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable