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Groups > linux.kernel > #1478495
| From | "Huang, Ying" <ying.huang@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 |
| Date | 2016-09-07 18:50 +0200 |
| Message-ID | <seOcW-2cL-33@gated-at.bofh.it> (permalink) |
| References | <seOcV-2cL-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Huang Ying <ying.huang@intel.com> In this patch, the size of the swap cluster is changed to that of the THP (Transparent Huge Page) on x86_64 architecture (512). This is for the THP swap support on x86_64. Where one swap cluster will be used to hold the contents of each THP swapped out. And some information of the swapped out THP (such as compound map count) will be recorded in the swap_cluster_info data structure. For other architectures which want THP swap support, THP_SWAP_CLUSTER need to be selected in the Kconfig file for the architecture. In effect, this will enlarge swap cluster size by 2 times on x86_64. Which may make it harder to find a free cluster when the swap space becomes fragmented. So that, this may reduce the continuous swap space allocation and sequential write in theory. The performance test in 0day shows no regressions caused by this. Cc: Hugh Dickins <hughd@google.com> Cc: Shaohua Li <shli@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: "Huang, Ying" <ying.huang@intel.com> --- arch/x86/Kconfig | 1 + mm/Kconfig | 13 +++++++++++++ mm/swapfile.c | 4 ++++ 3 files changed, 18 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4c39728..421d862 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -164,6 +164,7 @@ config X86 select HAVE_STACK_VALIDATION if X86_64 select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS select ARCH_HAS_PKEYS if X86_INTEL_MEMORY_PROTECTION_KEYS + select ARCH_USES_THP_SWAP_CLUSTER if X86_64 config INSTRUCTION_DECODER def_bool y diff --git a/mm/Kconfig b/mm/Kconfig index be0ee11..2da8128 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -503,6 +503,19 @@ config FRONTSWAP If unsure, say Y to enable frontswap. +config ARCH_USES_THP_SWAP_CLUSTER + bool + default n + +config THP_SWAP_CLUSTER + bool + depends on SWAP && TRANSPARENT_HUGEPAGE && ARCH_USES_THP_SWAP_CLUSTER + default y + help + Use one swap cluster to hold the contents of the THP + (Transparent Huge Page) swapped out. The size of the swap + cluster will be same as that of THP. + config CMA bool "Contiguous Memory Allocator" depends on HAVE_MEMBLOCK && MMU diff --git a/mm/swapfile.c b/mm/swapfile.c index 8f1b97d..4b78402 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -196,7 +196,11 @@ static void discard_swap_cluster(struct swap_info_struct *si, } } +#ifdef CONFIG_THP_SWAP_CLUSTER +#define SWAPFILE_CLUSTER (HPAGE_SIZE / PAGE_SIZE) +#else #define SWAPFILE_CLUSTER 256 +#endif #define LATENCY_LIMIT 256 static inline void cluster_set_flag(struct swap_cluster_info *info, -- 2.8.1
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[PATCH -v3 00/10] THP swap: Delay splitting THP during swapping out "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
[PATCH -v3 02/10] mm, memcg: Add swap_cgroup_iter iterator "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
[PATCH -v3 08/10] mm, THP: Add can_split_huge_page() "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
Re: [PATCH -v3 08/10] mm, THP: Add can_split_huge_page() "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-09-08 13:20 +0200
Re: [PATCH -v3 08/10] mm, THP: Add can_split_huge_page() "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 19:10 +0200
[PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 10:30 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 11:20 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 20:10 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-09-08 13:10 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 19:40 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-09-08 13:10 +0200
Re: [PATCH -v3 01/10] mm, swap: Make swap cluster size same of THP size on x86_64 "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 19:30 +0200
[PATCH -v3 05/10] mm, THP, swap: Add get_huge_swap_page() "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
Re: [PATCH -v3 05/10] mm, THP, swap: Add get_huge_swap_page() "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-09-08 13:20 +0200
Re: [PATCH -v3 05/10] mm, THP, swap: Add get_huge_swap_page() "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 19:30 +0200
[PATCH -v3 09/10] mm, THP, swap: Support to split THP in swap cache "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
[PATCH -v3 06/10] mm, THP, swap: Support to clear SWAP_HAS_CACHE for huge page "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
[PATCH -v3 03/10] mm, memcg: Support to charge/uncharge multiple swap entries "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
Re: [PATCH -v3 03/10] mm, memcg: Support to charge/uncharge multiple swap entries Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 10:30 +0200
Re: [PATCH -v3 03/10] mm, memcg: Support to charge/uncharge multiple swap entries "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 20:20 +0200
Re: [PATCH -v3 03/10] mm, memcg: Support to charge/uncharge multiple swap entries Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 10:40 +0200
[PATCH -v3 04/10] mm, THP, swap: Add swap cluster allocate/free functions "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
Re: [PATCH -v3 04/10] mm, THP, swap: Add swap cluster allocate/free functions Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 10:40 +0200
Re: [PATCH -v3 04/10] mm, THP, swap: Add swap cluster allocate/free functions "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 20:20 +0200
Re: [PATCH -v3 04/10] mm, THP, swap: Add swap cluster allocate/free functions Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 11:00 +0200
[PATCH -v3 07/10] mm, THP, swap: Support to add/delete THP to/from swap cache "Huang, Ying" <ying.huang@intel.com> - 2016-09-07 18:50 +0200
Re: [PATCH -v3 07/10] mm, THP, swap: Support to add/delete THP to/from swap cache Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-09-08 11:10 +0200
Re: [PATCH -v3 07/10] mm, THP, swap: Support to add/delete THP to/from swap cache "Huang\, Ying" <ying.huang@intel.com> - 2016-09-08 20:20 +0200
Re: [PATCH -v3 00/10] THP swap: Delay splitting THP during swapping out Minchan Kim <minchan@kernel.org> - 2016-09-09 07:50 +0200
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