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Message-ID: <CA+55aFwxWZ9-xLsZoi+iFMjkt-+V64q4jfMz=dampgJrMX5Ncw@mail.gmail.com> Date: Wed, 28 Mar 2012 16:36:23 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: "Theodore Ts'o" <tytso@....edu> Cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>, Fengguang Wu <fengguang.wu@...el.com> Subject: Re: GIT PULL] ext4 updates for 3.4 On Mon, Mar 26, 2012 at 11:07 AM, Theodore Ts'o <tytso@....edu> wrote: > > Ext4 commits for 3.3 merge window; mostly cleanups and bug fixes Ted, is there any chance that the dirty handling (or something else) has some serious latency bug? I'm compiling an allmodconfig kernel, and my mouse is (sometimes) very erratic with bad latency. And the biggest changes in the kernel I'm running on that machine now (HEAD=529b73fc0a97) and the previous boot of that machine (HEAD=e22057c85993) are the ext4 changes. (Sure, there are tons of other changes in between, but they tend to be ARM changes or drivers that are irrelevant). It may be that the bad interactive behavior started earlier, but I'd have expected to notice it - it really is pretty bad, and I've been doing allmodconfig builds pretty regularly. (Adding Jan and Fengguang to the cc too, in case it's that inode_sync_wait() change that *should* be a no-op, but maybe somebody overlooked something) NOTE! Latency normally is perfectly fine. Then *occasionally* something bad happens, and it's horrible for a while. I have no idea what triggers it. It's a regular "make -j16" of an x86-64 allmodconfig build, and that should *not* be nearly enough to make this machine stutter noticeably enough for the mouse pointer to not move smoothly. I have no real data for this, though - just a "mouse pointer occasionally freezing up". So I'm looking for a potential "hmm, that makes me wonder if..." kind of reaction. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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