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Commit 61d2d372 authored by Adam Lesinski's avatar Adam Lesinski
Browse files

BatteryStats: Stop reading kernel memory stats when unvailable 

Bug: 37689111
Test: manual
Change-Id: Ib14e4db14870a47da4f4d72bee613486fb976b78
parent 33532e02

core/java/com/android/internal/os/KernelMemoryBandwidthStats.java

+13 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ import android.util.Slog; 
import com.android.internal.annotations.VisibleForTesting;



import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;
@@ -24,14 +25,25 @@ import java.io.IOException; 
public class KernelMemoryBandwidthStats {

    private static final String TAG = "KernelMemoryBandwidthStats";



    final protected LongSparseLongArray mBandwidthEntries = new LongSparseLongArray();

    private static final String mSysfsFile = "/sys/kernel/memory_state_time/show_stat";

    private static final boolean DEBUG = false;



    protected final LongSparseLongArray mBandwidthEntries = new LongSparseLongArray();

    private boolean mStatsDoNotExist = false;



    public void updateStats() {

        if (mStatsDoNotExist) {

            // Skip reading.

            return;

        }



        StrictMode.ThreadPolicy policy = StrictMode.allowThreadDiskReads();

        try (BufferedReader reader = new BufferedReader(new FileReader(mSysfsFile))) {

            parseStats(reader);

        } catch (FileNotFoundException e) {

            Slog.w(TAG, "No kernel memory bandwidth stats available");

            mBandwidthEntries.clear();

            mStatsDoNotExist = true;

        } catch (IOException e) {

            Slog.e(TAG, "Failed to read memory bandwidth: " + e.getMessage());

            mBandwidthEntries.clear();