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From: yulei.kernel@gmail.com
To: akpm@linux-foundation.org, naoya.horiguchi@nec.com,
	viro@zeniv.linux.org.uk, pbonzini@redhat.com
Cc: linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, xiaoguangrong.eric@gmail.com,
	kernellwp@gmail.com, lihaiwei.kernel@gmail.com,
	Yulei Zhang <yuleixzhang@tencent.com>,
	Chen Zhuo <sagazchen@tencent.com>
Subject: [PATCH 13/35] mm, dmem: introduce PFN_DMEM and pfn_t_dmem
Date: Thu,  8 Oct 2020 15:54:03 +0800	[thread overview]
Message-ID: <8c193bcb9cfd7ccce174bc4bbc9c4f5239c1f5ed.1602093760.git.yuleixzhang@tencent.com> (raw)
In-Reply-To: <cover.1602093760.git.yuleixzhang@tencent.com>
In-Reply-To: <cover.1602093760.git.yuleixzhang@tencent.com>

From: Yulei Zhang <yuleixzhang@tencent.com>

Introduce PFN_DMEM as a new pfn flag for dmem pfn, define it
by setting (BITS_PER_LONG_LONG - 6) bit.

Introduce pfn_t_dmem() helper to recognize dmem pfn.

Signed-off-by: Chen Zhuo <sagazchen@tencent.com>
Signed-off-by: Yulei Zhang <yuleixzhang@tencent.com>
---
 include/linux/pfn_t.h | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index 2d9148221e9a..c6c0f1f84498 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -11,6 +11,7 @@
  * PFN_MAP - pfn has a dynamic page mapping established by a device driver
  * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not
  *		 get_user_pages
+ * PFN_DMEM - pfn references a dmem page
  */
 #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT))
 #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
@@ -18,13 +19,15 @@
 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
 #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
 #define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5))
+#define PFN_DMEM (1ULL << (BITS_PER_LONG_LONG - 6))
 
 #define PFN_FLAGS_TRACE \
 	{ PFN_SPECIAL,	"SPECIAL" }, \
 	{ PFN_SG_CHAIN,	"SG_CHAIN" }, \
 	{ PFN_SG_LAST,	"SG_LAST" }, \
 	{ PFN_DEV,	"DEV" }, \
-	{ PFN_MAP,	"MAP" }
+	{ PFN_MAP,	"MAP" }, \
+	{ PFN_DMEM,	"DMEM" }
 
 static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
 {
@@ -128,4 +131,16 @@ static inline bool pfn_t_special(pfn_t pfn)
 	return false;
 }
 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
+#ifdef CONFIG_ARCH_HAS_PTE_DMEM
+static inline bool pfn_t_dmem(pfn_t pfn)
+{
+	return (pfn.val & PFN_DMEM) == PFN_DMEM;
+}
+#else
+static inline bool pfn_t_dmem(pfn_t pfn)
+{
+	return false;
+}
+#endif /* CONFIG_ARCH_HAS_PTE_DMEM */
 #endif /* _LINUX_PFN_T_H_ */
-- 
2.28.0


  parent reply	other threads:[~2020-10-08  7:54 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08  7:53 [PATCH 00/35] Enhance memory utilization with DMEMFS yulei.kernel
2020-10-08  7:53 ` [PATCH 01/35] fs: introduce dmemfs module yulei.kernel
2020-11-10 20:04   ` Al Viro
2020-11-11  8:53     ` yulei zhang
2020-11-11 23:09       ` Al Viro
2020-11-12 10:03         ` yulei zhang
2020-10-08  7:53 ` [PATCH 02/35] mm: support direct memory reservation yulei.kernel
2020-10-08 20:27   ` Randy Dunlap
2020-10-08 20:34   ` Randy Dunlap
2020-10-08  7:53 ` [PATCH 03/35] dmem: implement dmem memory management yulei.kernel
2020-10-08  7:53 ` [PATCH 04/35] dmem: let pat recognize dmem yulei.kernel
2020-10-13  7:27   ` Paolo Bonzini
2020-10-13  9:53     ` yulei zhang
2020-10-08  7:53 ` [PATCH 05/35] dmemfs: support mmap yulei.kernel
2020-10-08  7:53 ` [PATCH 06/35] dmemfs: support truncating inode down yulei.kernel
2020-10-08  7:53 ` [PATCH 07/35] dmem: trace core functions yulei.kernel
2020-10-08  7:53 ` [PATCH 08/35] dmem: show some statistic in debugfs yulei.kernel
2020-10-08 20:23   ` Randy Dunlap
2020-10-09 11:49     ` yulei zhang
2020-10-08  7:53 ` [PATCH 09/35] dmemfs: support remote access yulei.kernel
2020-10-08  7:54 ` [PATCH 10/35] dmemfs: introduce max_alloc_try_dpages parameter yulei.kernel
2020-10-08  7:54 ` [PATCH 11/35] mm: export mempolicy interfaces to serve dmem allocator yulei.kernel
2020-10-08  7:54 ` [PATCH 12/35] dmem: introduce mempolicy support yulei.kernel
2020-10-08  7:54 ` yulei.kernel [this message]
2020-10-08  7:54 ` [PATCH 14/35] mm, dmem: dmem-pmd vs thp-pmd yulei.kernel
2020-10-08  7:54 ` [PATCH 15/35] mm: add pmd_special() check for pmd_trans_huge_lock() yulei.kernel
2020-10-08  7:54 ` [PATCH 16/35] dmemfs: introduce ->split() to dmemfs_vm_ops yulei.kernel
2020-10-08  7:54 ` [PATCH 17/35] mm, dmemfs: support unmap_page_range() for dmemfs pmd yulei.kernel
2020-10-08  7:54 ` [PATCH 18/35] mm: follow_pmd_mask() for dmem huge pmd yulei.kernel
2020-10-08  7:54 ` [PATCH 19/35] mm: gup_huge_pmd() " yulei.kernel
2020-10-08  7:54 ` [PATCH 20/35] mm: support dmem huge pmd for vmf_insert_pfn_pmd() yulei.kernel
2020-10-08  7:54 ` [PATCH 21/35] mm: support dmem huge pmd for follow_pfn() yulei.kernel
2020-10-08  7:54 ` [PATCH 22/35] kvm, x86: Distinguish dmemfs page from mmio page yulei.kernel
2020-10-09  0:58   ` Sean Christopherson
2020-10-09 10:28     ` Joao Martins
2020-10-09 11:42       ` yulei zhang
2020-10-08  7:54 ` [PATCH 23/35] kvm, x86: introduce VM_DMEM yulei.kernel
2020-10-08  7:54 ` [PATCH 24/35] dmemfs: support hugepage for dmemfs yulei.kernel
2020-10-08  7:54 ` [PATCH 25/35] mm, x86, dmem: fix estimation of reserved page for vaddr_get_pfn() yulei.kernel
2020-10-08  7:54 ` [PATCH 26/35] mm, dmem: introduce pud_special() yulei.kernel
2020-10-08  7:54 ` [PATCH 27/35] mm: add pud_special() to support dmem huge pud yulei.kernel
2020-10-08  7:54 ` [PATCH 28/35] mm, dmemfs: support huge_fault() for dmemfs yulei.kernel
2020-10-08  7:54 ` [PATCH 29/35] mm: add follow_pte_pud() yulei.kernel
2020-10-08  7:54 ` [PATCH 30/35] dmem: introduce dmem_bitmap_alloc() and dmem_bitmap_free() yulei.kernel
2020-10-08  7:54 ` [PATCH 31/35] dmem: introduce mce handler yulei.kernel
2020-10-08  7:54 ` [PATCH 32/35] mm, dmemfs: register and handle the dmem mce yulei.kernel
2020-10-08  7:54 ` [PATCH 33/35] kvm, x86: temporary disable record_steal_time for dmem yulei.kernel
2020-10-08  7:54 ` [PATCH 34/35] dmem: add dmem unit tests yulei.kernel
2020-10-08  7:54 ` [PATCH 35/35] Add documentation for dmemfs yulei.kernel
2020-10-09  1:26   ` Randy Dunlap
2020-10-08 19:01 ` [PATCH 00/35] Enhance memory utilization with DMEMFS Joao Martins
2020-10-09 11:39   ` yulei zhang
2020-10-09 11:53     ` Joao Martins
2020-10-10  8:15       ` yulei zhang
2020-10-12 10:59         ` Joao Martins
2020-10-14 22:25           ` Dan Williams
2020-10-19 13:37             ` Paolo Bonzini
2020-10-19 19:03               ` Joao Martins
2020-10-20 15:22                 ` yulei zhang
2020-10-12 11:57 ` Zengtao (B)
2020-10-13  2:45   ` yulei zhang

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