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Message-ID: <CAF1ivSaAcZfwAmdUhH1SZeaRLokNBVA4ScxTWeifHVWXiX_e-Q@mail.gmail.com> Date: Wed, 25 Sep 2013 22:53:22 +0800 From: Lin Ming <minggr@...il.com> To: Peter Hurley <peter@...leysoftware.com> Cc: Fengguang Wu <fengguang.wu@...el.com>, Greg KH <gregkh@...uxfoundation.org>, LKML <linux-kernel@...r.kernel.org>, lkp@...org, Tejun Heo <tj@...nel.org> Subject: Re: increased vmap_area_lock contentions on "n_tty: Move buffers into n_tty_data" On Wed, Sep 25, 2013 at 7:30 PM, Peter Hurley <peter@...leysoftware.com> wrote: > On 09/25/2013 05:04 AM, Lin Ming wrote: >> >> On Wed, Sep 18, 2013 at 8:22 AM, Peter Hurley <peter@...leysoftware.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 > -- 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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