The patch titled
Subject: mm: introduce common struct mm_slot
has been added to the -mm mm-unstable branch. Its filename is
mm-introduce-common-struct-mm_slot.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-introduce-common-struct-mm_slot.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Subject: mm: introduce common struct mm_slot
Date: Wed, 31 Aug 2022 11:19:45 +0800
Patch series "add common struct mm_slot and use it in THP and KSM", v2.
At present, both THP and KSM module have similar structures mm_slot for
organizing and recording the information required for scanning mm, and
each defines the following exactly the same operation functions:
- alloc_mm_slot
- free_mm_slot
- get_mm_slot
- insert_to_mm_slots_hash
In order to de-duplicate these codes, this patchset introduces a common
struct mm_slot, and lets THP and KSM to use it.
This patch (of 7):
At present, both THP and KSM module have similar structures mm_slot for
organizing and recording the information required for scanning mm, and
each defines the following exactly the same operation functions:
- alloc_mm_slot
- free_mm_slot
- get_mm_slot
- insert_to_mm_slots_hash
In order to de-duplicate these codes, this patch introduces a common
struct mm_slot, and subsequent patches will let THP and KSM to use it.
Link: https://lkml.kernel.org/r/20220831031951.43152-1-zhengqi.arch@xxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20220831031951.43152-2-zhengqi.arch@xxxxxxxxxxxxx
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mm_slot.h | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
--- /dev/null
+++ a/mm/mm_slot.h
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef _LINUX_MM_SLOT_H
+#define _LINUX_MM_SLOT_H
+
+#include <linux/hashtable.h>
+#include <linux/slab.h>
+
+/*
+ * struct mm_slot - hash lookup from mm to mm_slot
+ * @hash: link to the mm_slots hash list
+ * @mm_node: link into the mm_slots list
+ * @mm: the mm that this information is valid for
+ */
+struct mm_slot {
+ struct hlist_node hash;
+ struct list_head mm_node;
+ struct mm_struct *mm;
+};
+
+#define mm_slot_entry(ptr, type, member) \
+ container_of(ptr, type, member)
+
+static inline void *mm_slot_alloc(struct kmem_cache *cache)
+{
+ if (!cache) /* initialization failed */
+ return NULL;
+ return kmem_cache_zalloc(cache, GFP_KERNEL);
+}
+
+static inline void mm_slot_free(struct kmem_cache *cache, void *objp)
+{
+ kmem_cache_free(cache, objp);
+}
+
+#define mm_slot_lookup(_hashtable, _mm) \
+({ \
+ struct mm_slot *tmp_slot, *mm_slot = NULL; \
+ \
+ hash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \
+ if (_mm == tmp_slot->mm) { \
+ mm_slot = tmp_slot; \
+ break; \
+ } \
+ \
+ mm_slot; \
+})
+
+#define mm_slot_insert(_hashtable, _mm, _mm_slot) \
+({ \
+ _mm_slot->mm = _mm; \
+ hash_add(_hashtable, &_mm_slot->hash, (unsigned long)_mm); \
+})
+
+#endif /* _LINUX_MM_SLOT_H */
_
Patches currently in -mm which might be from zhengqi.arch@xxxxxxxxxxxxx are
mm-thp-remove-redundant-pgtable-check-in-set_huge_zero_page.patch
mm-introduce-common-struct-mm_slot.patch
mm-thp-convert-to-use-common-struct-mm_slot.patch
ksm-remove-redundant-declarations-in-ksmh.patch
ksm-add-the-ksm-prefix-to-the-names-of-the-ksm-private-structures.patch
ksm-convert-ksm_mm_slotmm_list-to-ksm_mm_slotmm_node.patch
ksm-convert-ksm_mm_slotlink-to-ksm_mm_slothash.patch
ksm-convert-to-use-common-struct-mm_slot.patch
