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sparc64: Reduce TLB flushes during hugepte changes

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[ Upstream commit 24e49ee3d7 ]

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nitin Gupta 2016-03-30 11:17:13 -07:00 • committed by Greg Kroah-Hartman
commit 87575e31be
6 changed files with 97 additions and 51 deletions
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