Mike Kravetz 1e953d846a sparc64 mm: Fix more TSB sizing issues ... Commit af1b1a9b36 ("sparc64 mm: Fix base TSB sizing when hugetlb pages are used") addressed the difference between hugetlb and THP pages when computing TSB sizes. The following additional issues were also discovered while working with the code. In order to save memory, THP makes use of a huge zero page. This huge zero page does not count against a task's RSS, but it does consume TSB entries. This is similar to hugetlb pages. Therefore, count huge zero page entries in hugetlb_pte_count. Accounting of THP pages is done in the routine set_pmd_at(). Unfortunately, this does not catch the case where a THP page is split. To handle this case, decrement the count in pmdp_invalidate(). pmdp_invalidate is only called when splitting a THP. However, 'sanity checks' are added in case it is ever called for other purposes. A more general issue exists with HPAGE_SIZE accounting. hugetlb_pte_count tracks the number of HPAGE_SIZE (8M) pages. This value is used to size the TSB for HPAGE_SIZE pages. However, each HPAGE_SIZE page consists of two REAL_HPAGE_SIZE (4M) pages. The TSB contains an entry for each REAL_HPAGE_SIZE page. Therefore, the number of REAL_HPAGE_SIZE pages should be used to size the huge page TSB. A new compile time constant REAL_HPAGE_PER_HPAGE is used to multiply hugetlb_pte_count before sizing the TSB. Changes from V1 - Fixed build issue if hugetlb or THP not configured Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-09-28 08:24:02 -07:00
..
boot	sparc: Add "install" target	2014-08-04 20:45:59 -07:00
configs	sparc/defconfigs: Remove CONFIG_IPV6_PRIVACY	2016-04-21 16:43:44 -04:00
crypto	crypto: sparc - initialize blkcipher.ivsize	2015-10-08 21:36:48 +08:00
include	sparc64 mm: Fix more TSB sizing issues	2016-09-28 08:24:02 -07:00
kernel	sparc: support static_key usage in non-module __exit sections	2016-08-04 08:50:07 -04:00
lib	locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()	2016-06-16 10:48:30 +02:00
math-emu	arch/sparc/math-emu/math_32.c: drop stray break operator	2014-08-04 20:29:06 -07:00
mm	sparc64 mm: Fix more TSB sizing issues	2016-09-28 08:24:02 -07:00
net	sparc: Fix misspellings in comments.	2016-03-20 21:28:58 -07:00
oprofile
power	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc	2014-10-11 20:36:34 -04:00
prom	sparc64: Fix register corruption in top-most kernel stack frame during boot.	2014-10-24 09:52:49 -07:00
Kbuild
Kconfig	sparc/uaccess: Enable hardened usercopy	2016-07-26 14:41:52 -07:00
Kconfig.debug
Makefile	sparc32: Add -Wa,-Av8 to KBUILD_CFLAGS.	2016-03-01 00:24:04 -05:00