1043823 - [Flame][Camera]Video recording will keep consuming free memory and growing cache

Status: RESOLVED INVALID

(Firefox OS Graveyard :: Gaia::Camera, defect)

Description

[Mike Lien[:mlien]]

[Device]
  Flame
---------------------------------------------
[Reproduction build] - v122 base image + pvt gaia/gecko
  Gaia      c72257b2d27135bfcd68e89dd584182797784016
  Gecko     https://hg.mozilla.org/mozilla-central/rev/616e6924cb0b
  BuildID   20140724160202
  Version   34.0a1
  ro.build.version.incremental=109
  ro.build.date=Mon Jun 16 16:51:29 CST 2014

---------------------------------------------
[Reproduce Steps]
  0. Turn on adb
  1. Enter command "while true; do adb shell b2g-info; sleep 1; done" on terminal to monitor memory 
  2. Launch Camera app
  3. Switch to video recording mode
  4. Start to record video
  5. Verify memory change

---------------------------------------------
[Expected Result]
  Memory should be used in a reasonable range

---------------------------------------------
[Actual Result]
  Video Recording will keep consuming free memory and growing cache
  Only use Flame base image v1.3 is fine
  Both Flame v1.4 and v2.0 have the same problem

---------------------------------------------
[Reproduce Rate]
  100%

Comment 1

[Mike Habicher [:mikeh] (high bugzilla latency)]

[Blocking Requested - why for this release]: prioritization of investigation.

Comment 2

[Dave Hylands [:dhylands]]

This sounds like expected behavior to me.

When writing a file to disk, the kernel writes the file contents to cache, and the writes it to disk. The file stays around in the cache in case you want to read it.

If needed, the cache pages will be kicked out.

Comment 3

[Mike Habicher [:mikeh] (high bugzilla latency)]

De-noming as this sounds like expected behaviour.

Mike: when carrying out the STR, does the device exhibit any weird or non-performant behaviour? If not, I think we can close this.

Comment 4

[Mike Lien[:mlien]]

Re-test with Flame 1GB on v123+v2.0 gaia/gecko
Video recording will consume memory until memory less than 15~20 MB
But no any weird or non-performant behaviour.

Gaia      a36a504f35bd9d1c20726624abe6433ce5dbfb54
Gecko     https://hg.mozilla.org/releases/mozilla-b2g32_v2_0/rev/4f9ee0d8dee8
BuildID   20140820160203
Version   32.0

Comment 5

[Mike Habicher [:mikeh] (high bugzilla latency)]

Sounds like this is the cache expanding to fill available memory. It is normal and expected.

If we observe any weird or sluggish behaviour, we should open a new bug.