Messages in this thread | | | Subject | Re: [f2fs-dev] [PATCH v4] f2fs: introduce fragment allocation mode mount option | From | Chao Yu <> | Date | Wed, 22 Sep 2021 23:23:39 +0800 |
| |
On 2021/9/21 6:57, Jaegeuk Kim wrote: > On 09/12, Chao Yu wrote: >> On 2021/9/11 7:13, Jaegeuk Kim wrote: >>> Wait. Why do we need to add so many options here? I was expecting to see >>> performance difference when getting random segments or random blocks as >>> an extreme case. I don't get the point why we need the middle of those cases. >> >> I guess we can simply the aging test procedure of filesystem by changing a bit >> based on this patch. > > My question was on "fragment:fixed_block".
This mode can be used for below filesystem aging scenario.
Fragmenting filesystem with specified pattern: 1M chunk | 1M hole | 1M chunk | 1M hole | ...
e.g.
Before 1. create/write 10 1M files: file0 file1 file2 ... file9 2. remove file1 file3 file5 ... file9
After mode=fragment:fixed_block fragment_chunk_size=1M fragment_hole_size=1M 1. create/write one 10M file
Thanks,
> >> >> See comments in below thread. >> >> https://lore.kernel.org/lkml/425daf77-8020-26ce-dc9f-019d9a881b78@kernel.org/ >> >> Thanks,
| |