libsnapshot: Tune readahead during OTA for source and COW block device
Scanning of partitions post OTA leads to memory pressure. Tune
the read-ahead of source and COW block device. This is currently
set to 32KB.
This reduces Inactive(file) and Active(file) usage during entire
duration of boot post OTA.
On Pixel 6: For incremental OTA ~400M. During boot:
Without-patch With-patch Delta
--------------------------------------------
1: Peak Inactive(file): 4469MB 3118MB ~30%
2: Peak Active(file): 985MB 712MB ~27%
No regression observed on boot time.
Additionally, cut down the number of threads to verify the partitions.
Bug: 311233916
Test: Incremental OTA on Pixel 6
Change-Id: I0b842776c36fa089c39c170fa7bf0f246e16636d
Signed-off-by: Akilesh Kailash <akailash@google.com>
3 files changed