New Patches Allow For Deleting Files ~54% Faster On F2FS

A set of patches sent out today for testing allow for faster truncating on the Flash-Friendly File-System (F2FS) that can yield around a 54% speed-up for deleting files.

Yi Sun with Unisoc sent out the two patches for speeding up F2FS truncate handling due to deleting large files being time consuming for this file-system. The performance impact from this F2FS optimization work is clear:

If some blocks are continuous and belong to the same segment, we can process these blocks at the same time. This can reduce
the number of calls to the down_write() and the up_write(), thereby improving the overall speed of doing truncate.

Test steps:
Set the CPU and DDR frequencies to the maximum.
dd if=/dev/random of=./test.txt bs=1M count=100000
sync
rm test.txt

Time Comparison of rm:
original optimization ratio
7.17s 3.27s 54.39%

Currently the patches are marked as request for comments (RFC) but hopefully everything will pan out and this optimization work will be picked up for speeding up file deletion on F2FS.