Messages in this thread | | | Date | Wed, 25 Sep 2013 07:30:40 -0400 | From | Peter Hurley <> | Subject | Re: increased vmap_area_lock contentions on "n_tty: Move buffers into n_tty_data" |
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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.
Regards, Peter Hurley
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