On Wed, May 27, 2009 at 12:36:49PM +0200, Nick Barkas wrote: > I sent this out to fs_at_ last night, but it was suggested that I send it > here for more eyes and potential testers. > > Hello > Some time during the next week or so, I plan on committing the attached > patch. It adds a vm_lowmem event handler to the dirhash code in UFS2 so > that dirhashes will be deleted when the system is low on memory. This > allows one to increase the maximum amount of memory available for > dirhash on machines that have memory to spare (via the > vfs.ufs.dirhash_maxmem sysctl), and hopefully just improving behaviour > in low memory situations. I worked on this last year for the summer of > code with David Malone as my mentor. cool! do you have any performance numbers? graphs? :) what value do you recommend for the dirhash_maxmem sysctl? thnx! roman
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