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Date: Fri, 22 Mar 2013 06:22:32 +0000 From: Al Viro <viro@...IV.linux.org.uk> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Dave Jones <davej@...hat.com>, Linux Kernel <linux-kernel@...r.kernel.org>, "Eric W. Biederman" <ebiederm@...ssion.com> Subject: Re: [CFT] Re: VFS deadlock ? On Fri, Mar 22, 2013 at 06:09:53AM +0000, Al Viro wrote: > Hell knows... At the very least, I'd expect /proc/self to be fairly hot. > During the boot time - /proc/mounts, /proc/filesystems, /proc/cmdline... > Dunno. Would be interesting to slap a printk into proc_lookup_de() and > see how much (and what) does it hit on a busy system... FWIW, I'd done a quick and dirty stats collector right now - added hit count into proc_dir_entry + /proc/counts walking the pde tree and dumping the counts. Left it running in practically idle kvm testbox, after boot it shows kmsg => 2 kcore => 4 version => 4 uptime => 3 stat => 38 meminfo => 22 loadavg => 2 devices => 4 consoles => 4 cmdline => 109 filesystems => 118 swaps => 8 modules => 2 misc => 1 acpi => 6 fb => 1 counts => 14 sys => 1 bus => 1 fs => 1 net => 18 mounts => 10 self => 123 IOW, counts on this one are very low so far. OTOH, that kvm image is practically idle, doesn't have desktop shite on it, etc. This really ought to be checked on something busy... The first impression is that the stuff outside of /proc/<pid> and /proc/sys isn't hot enough to care about any cache retention... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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