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| author |   Thomas Gleixner <tglx@linutronix.de> | 2018-09-17 16:29:12 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-09-27 20:39:38 +0200 |
| commit | 5c280cf6081ff99078e28b51172d78359f194fd9 (patch) | |
| tree | afe95954061d8f2350f4114c58f8570ddbd315d4 /arch/x86/Kconfig | |
| parent | x86/mm/cpa: Add debug mechanism (diff) | |
| download | linux-dev-5c280cf6081ff99078e28b51172d78359f194fd9.tar.xz linux-dev-5c280cf6081ff99078e28b51172d78359f194fd9.zip | |
x86/mm/cpa: Add large page preservation statistics
The large page preservation mechanism is just magic and provides no
information at all. Add optional statistic output in debugfs so the magic can
be evaluated. Defaults is off.
Output:
1G pages checked: 2
1G pages sameprot: 0
1G pages preserved: 0
2M pages checked: 540
2M pages sameprot: 466
2M pages preserved: 47
4K pages checked: 800770
4K pages set-checked: 7668
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Bin Yang <bin.yang@intel.com>
Cc: Mark Gross <mark.gross@intel.com>
Link: https://lkml.kernel.org/r/20180917143546.160867778@linutronix.de
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1a0be022f91d..65728bb1182c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1491,6 +1491,14 @@ config X86_DIRECT_GBPAGES supports them), so don't confuse the user by printing that we have them enabled. +config X86_CPA_STATISTICS + bool "Enable statistic for Change Page Attribute" + depends on DEBUG_FS + ---help--- + Expose statistics about the Change Page Attribute mechanims, which + helps to determine the effectivness of preserving large and huge + page mappings when mapping protections are changed. + config ARCH_HAS_MEM_ENCRYPT def_bool y |