Postphone v1.1.0

Android, Featured, Programming, , , ,

There’s a new version of Postphone. Huge list of things, here’s the full changelog:

    Improvements:
      New feat Google Android Backup Service (settings and database)
      Issue-001 now app keeps alarms upon reboot
      Hotfix-002 now when you receive a call with unknown Caller ID, 
           no popup is shown
    
    Application workflow:
      You must check or dismiss notification to remove alarm
    
    Code:
      Min SDK change from 7 to 8 (drop support for Eclair)
      DatabaseHelper class replaces DBAdapter
      Allow to upgrade from db v0 to db v1 and allow future upgrades
      Remove old code doTheVibration() and playSound()
      File rename popupcallback => popupcallback.xml
      Fix some typos
      Lower the number of events logged
    
    Developer side:
      New utility emulate-reboot
      New utility insert-fake-passed-calls with support for TZ
      New utilities for backup
      Change tmp path in sqlite-postphone-db utility
      Publish notes
      Backup notes
    
    Debug menu:
      Is disabled by default
      Can now be enabled via multiple taps on version name
      New menu entry "clear alarms table"
      New menu entry "test PopUpAfterCall"
    
    Design and blog:
      Blog featured banner
      Official logo.png

Debugging IO on Android

Android, Galaxy Nexus, How to, Linux, , , , , ,

Android is Linux based, so there are some interesting way to monitor and debug IO activity especially on storage.

The one I found more useful is this:

  1. enable dumping of IO info
    echo 1 > /proc/sys/vm/block_dump
  2. observe kernel log
    cat /proc/kmsg
  3. make your analysis
  4. disable dumping of IO info
    echo 0 > /proc/sys/vm/block_dump

The output you will get is similar to this:
<7>[71477.927886] kswapd0(24): WRITE block 21240712 on mmcblk0p12 (8 sectors)
<7>[71477.928436] kswapd0(24): WRITE block 21410792 on mmcblk0p12 (8 sectors)
<7>[71477.928710] kswapd0(24): WRITE block 21240704 on mmcblk0p12 (8 sectors)
<7>[71477.929016] kswapd0(24): WRITE block 21240656 on mmcblk0p12 (8 sectors)
<7>[71477.929443] kswapd0(24): WRITE block 25427968 on mmcblk0p12 (8 sectors)
<7>[71477.929687] kswapd0(24): WRITE block 8 on mmcblk0p12 (8 sectors)
<7>[71477.930084] kswapd0(24): WRITE block 0 on mmcblk0p12 (8 sectors)
<7>[71478.086639] sdcard(159): READ block 23431168 on mmcblk0p12 (256 sectors)
<7>[71478.087036] sdcard(159): READ block 23430912 on mmcblk0p12 (8 sectors)
<7>[71478.258148] sdcard(159): READ block 23430920 on mmcblk0p12 (200 sectors)
<7>[71478.258514] sdcard(159): READ block 23431424 on mmcblk0p12 (8 sectors)
<7>[71478.266967] sdcard(138): READ block 23430656 on mmcblk0p12 (32 sectors)
<7>[71478.268798] sdcard(159): READ block 23430688 on mmcblk0p12 (64 sectors)
<7>[71478.269409] sdcard(159): READ block 23430752 on mmcblk0p12 (128 sectors)
<7>[71478.271484] sdcard(159): READ block 23430880 on mmcblk0p12 (32 sectors)
<7>[71478.600646] sdcard(138): READ block 23431432 on mmcblk0p12 (512 sectors)
<7>[71478.765136] sdcard(159): READ block 23431944 on mmcblk0p12 (256 sectors)
<7>[71478.958129] Compiler(412): READ block 327320 on mmcblk0p11 (8 sectors)
<7>[71478.958557] Compiler(412): READ block 327400 on mmcblk0p11 (48 sectors)

Tried on my rooted Galaxy Nexus with CyanogenMod 10.1.0-RC1.