Re: [PATCH v3] sparc64: Reduce TLB flushes during hugepte changes

From	David Miller <davem@davemloft.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH v3] sparc64: Reduce TLB flushes during hugepte changes
Date	2016-03-30 01:50 +0200
Message-ID	<ribyy-57X-23@gated-at.bofh.it> (permalink)
References	<ri9do-3wv-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: Nitin Gupta <nitin.m.gupta@oracle.com>
Date: Tue, 29 Mar 2016 14:11:14 -0700

> During hugepage map/unmap, TSB and TLB flushes are currently
> issued at every PAGE_SIZE'd boundary which is unnecessary.
> We now issue the flush at REAL_HPAGE_SIZE boundaries only.
> 
> Without this patch workloads which unmap a large hugepage
> backed VMA region get CPU lockups due to excessive TLB
> flush calls.
> 
> Orabug: 22365539, 22643230, 22995196
> 
> Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>

You really need to put some more work into this, there are lots of
config variants you didn't even test.

See the kbuild robot replies...

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[PATCH v3] sparc64: Reduce TLB flushes during hugepte changes Nitin Gupta <nitin.m.gupta@oracle.com> - 2016-03-29 23:20 +0200
  Re: [PATCH v3] sparc64: Reduce TLB flushes during hugepte changes kbuild test robot <lkp@intel.com> - 2016-03-30 00:40 +0200
  Re: [PATCH v3] sparc64: Reduce TLB flushes during hugepte changes David Miller <davem@davemloft.net> - 2016-03-30 01:50 +0200

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