From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:48291 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753748AbbK0Dis (ORCPT ); Thu, 26 Nov 2015 22:38:48 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1a29rv-0006YF-05 for linux-btrfs@vger.kernel.org; Fri, 27 Nov 2015 04:38:43 +0100 Received: from ip98-167-165-199.ph.ph.cox.net ([98.167.165.199]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 27 Nov 2015 04:38:42 +0100 Received: from 1i5t5.duncan by ip98-167-165-199.ph.ph.cox.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 27 Nov 2015 04:38:42 +0100 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: btrfs: poor performance on deleting many large files Date: Fri, 27 Nov 2015 03:38:39 +0000 (UTC) Message-ID: References: <1448488198.4717.4.camel@gmail.com> <1448562347.8809.16.camel@scientia.net> <1448582805.11377.9.camel@scientia.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Christoph Anton Mitterer posted on Fri, 27 Nov 2015 01:06:45 +0100 as excerpted: > And additionally, allow people to mount subvols with different > noatime/relatime/atime settings (unless that's already working)... that > way, they could enable it for things where they want/need it,... and > disable it where not. AFAIK, per-subvolume *atime mounts should already be working. The *atime mount options are filesystem-generic (aka Linux vfs level), and while I my own use-case doesn't involve subvolumes, the wiki says they should be working (wrapped link I'm not bothering to jump thru the hoops to properly unwrap): https://btrfs.wiki.kernel.org/index.php/FAQ #Can_I_mount_subvolumes_with_different_mount_options.3F So while personally untested, per-subvolume *atime mount options /should/ "just work". Meanwhile, I've simply grown to hate atime as an inefficient and mostly useless drain on resources, so I pretty much just noatime everything, the reason I decided to bother patching my kernel to make that the default, instead of having yet another option I use everywhere anyway, clogging up the options field in my fstab. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman