Re: [RFC] high preempt off latency in vfree path

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 03/22/16 19:44, Andi Kleen wrote:
(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.


Thanks Andi. I'll post a patch then.

Regards,
Joel

-Andi


--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>



[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]