On Wed, Oct 18, 2017 at 07:15:16PM -0700, Jaegeuk Kim wrote: > If some abnormal users try lots of atomic write operations, f2fs is able to > produce pinned pages in the main memory which affects system performance. > This patch limits that as 20% over total memory size, and if f2fs reaches > to the limit, it will drop all the inmemory pages.
Can you please document your "atomic" writes and how they pin memory in a mail to linux-abi? And how they compare to my O_ATOMIC implement as well as the papers it is based on? I tried to take a quick look at the code and it looks very bogus to me in addition to being sneaked in through fs-specific ioctls without any review whatsoever.
