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Date: Tue, 22 Mar 2016 19:44:02 -0700 From: Andi Kleen <ak@...ux.intel.com> To: Joel Fernandes <joelaf@...126.com> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, tj@...nel.org, linux-rt-users@...r.kernel.org, Nick Piggin <npiggin@...e.de> Subject: Re: [RFC] high preempt off latency in vfree path > (1) > One is we reduce the number of lazy_max_pages (right now its around 32MB per core worth of pages). > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index aa3891e..2720f4f 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -564,7 +564,7 @@ static unsigned long lazy_max_pages(void) > > log = fls(num_online_cpus()); > > - return log * (32UL * 1024 * 1024 / PAGE_SIZE); > + return log * (8UL * 1024 * 1024 / PAGE_SIZE); > } This seems like the right fix to me. Perhaps even make it somewhat smaller. Even on larger systems it's probably fine because they have a lot more cores/threads these days, so it will be still sufficiently large. -Andi
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