On 03/12/18 at 10:50, Adam Borowski wrote: > On Mon, Dec 03, 2018 at 10:33:44AM +0100, Alessandro Selli wrote: >> On 03/12/18 at 10:05, Adam Borowski wrote: >>> realtime greatly reduces atime writes, but it's still too much. >> I wouldn't say so. Since relatime updates atime only relative to the >> present ctime and mtime, it's only changed when one of those two is >> changed. That is, updating atime does not require a separate write >> operation. > That was the original design -- but alas, it was later changed so the atime > is updated at least once a day.
My experience is inconsistent with what you write: [alessandro@wkstn02 ~]$ mount | grep ' on /home ' /dev/mapper/part6_crypt_home on /home type ext4 (rw,relatime,nobarrier) [alessandro@wkstn02 ~]$ stat .xsession-errors.old File: .xsession-errors.old Size: 47036242 Blocks: 91880 IO Block: 4096 regular file Device: fd02h/64770d Inode: 655383 Links: 1 Access: (0600/-rw-------) Uid: ( 1000/ alessandro) Gid: ( 1000/ alessandro) Access: 2018-07-06 13:22:22.312846358 +0200 Modify: 2018-07-06 13:08:36.392798307 +0200 Change: 2018-07-06 13:22:17.149512721 +0200 Birth: - [alessandro@wkstn02 ~]$ date Mon Dec 3 11:18:47 CET 2018 [alessandro@wkstn02 ~]$ uname -r 4.19.5.wkstn02-0 [alessandro@wkstn02 ~]$ [...] > Every inode has to be updated. Only when it has to be updated. That is, only when attributes or data must be. -- Alessandro Selli <alessandrose...@linux.com> VOIP SIP: dhatarat...@ekiga.net Chiave firma e cifratura PGP/GPG signing and encoding key: BA651E4050DDFC31E17384BABCE7BD1A1B0DF2AE
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