Hi all, There are problem in this patch, please ignore this patch, sorry for the noise. I will resend later. > -----Original Message----- > From: Chao Yu [mailto:chao2.yu@xxxxxxxxxxx] > Sent: Saturday, June 14, 2014 7:48 PM > To: Jaegeuk Kim > Cc: linux-fsdevel@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > Subject: [f2fs-dev] [PATCH] f2fs: refactor flush_nat_entries codes for reducing NAT writes > > Although building NAT journal in cursum reduce the read/write work for NAT > block, but previous design leave us lower performance when write checkpoint > frequently for these cases: > 1. if journal in cursum has already full, it's a bit of waste that we flush all > nat entries to page for persistence, but not to cache any entries. > 2. if journal in cursum is not full, we fill nat entries to journal util > journal is full, then flush the left dirty entries to disk without merge > journaled entries, so these journaled entries may be flushed to disk at next > checkpoint but lost chance to flushed last time. > > In this patch we merge dirty entries located in same NAT block to nat entry set, > and linked all set to list, sorted ascending order by entries' count of set. > Later we flush entries in sparse set into journal as many as we can, and then > flush merged entries to disk. > -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
