Messages in this thread | | | Date | Wed, 25 Sep 2013 22:53:22 +0800 | Subject | Re: increased vmap_area_lock contentions on "n_tty: Move buffers into n_tty_data" | From | Lin Ming <> |
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On Wed, Sep 25, 2013 at 7:30 PM, Peter Hurley <peter@hurleysoftware.com> wrote: > On 09/25/2013 05:04 AM, Lin Ming wrote: >> >> On Wed, Sep 18, 2013 at 8:22 AM, Peter Hurley <peter@hurleysoftware.com> >> wrote: >> [snip] >>> >>> >>> Looking over vmalloc.c, the critical section footprint of the >>> vmap_area_lock >>> could definitely be reduced (even nearly eliminated), but that's a >>> project >>> for >>> another day :) >> >> >> Hi Peter, >> >> I also looked over vmallo.c, but didn't find obvious way to reduce the >> critical section footprint. >> Could you share some hints how to do this? > > > vmap_area_list is an RCU list. > get_vmalloc_info() doesn't need to take the vmap_area_lock at all. > Look at __purge_vmap_area_lazy() for a howto.
Looking at it now ...
Thanks, Lin Ming
> > Regards, > Peter Hurley >
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