Re: Query related to lookup
Re: Query related to lookup
- Subject: Re: Query related to lookup
- From: Ken Hornstein <email@hidden>
- Date: Thu, 11 Apr 2013 08:58:07 -0400
>Only way to see lookup for every stat syscall, was to disable auth cache
>by calling vfs_setauthcache_ttl(mp, 0)
>
>That's why I am confused about this ttl value: what does it controls,
>why setting non-zero ttl doesn't result into periodic lookup calls.
I'll admit that code is a bit confusing to me, and figuring out what is
going on would take more time than I want to invest right now.
I've found that when I get in a situation like this, one of the most effective
ways of figuring out what is going on is using a two-machine kernel debugging
setup to inspect exactly what is happening. The big issue there is setting
a breakpoint inside of the lookup path is going to be a challenge since
you'll be hitting that a lot. But with some effort you can make it work.
--Ken
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