Re: [f2fs-dev] [PATCH 4/4] f2fs: Run f2fs_write_end_io() asynchronously

On 6/10/26 5:14 AM, Chao Yu wrote:
> On 5/29/26 05:20, Bart Van Assche wrote:
>> +	/*
>> +	 * SZ_16K restricts the time spent on completing writes to about 150
>> +	 * microseconds on an Arm Cortex-A520 core.
>> +	 */
>> +	sbi->max_atc_write_bio_size = SZ_16K;
> 
> Actually, I don't see this problem before, can we disable this by default, and
> only enable for your case via sysfs?

The new behavior should be the default because interrupt handlers should
complete quickly.

F2FS is primarily used on Android systems. On an Android system spending
too much time in interrupt context can have the following consequences:
* User interface stuttering and frame drops (jank).
* Audio glitches.
* Application not responding (ANR).
* Connectivity degradation. Interfaces like Wi-Fi and Bluetooth depend
   on fast interrupt handling.

>> +	ATTR_LIST(max_atc_write_bio_size),
> 
> We need to update Documentation/ABI/testing/sysfs-fs-f2fs as well.

Will do.

Thanks,

Bart.


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