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authorQi Zheng <zhengqi.arch@bytedance.com>2022-08-31 11:19:45 +0800
committerAndrew Morton <akpm@linux-foundation.org>2022-10-03 14:02:43 -0700
commit7e736b8e36ff87080890690670c90c91d6d80091 (patch)
treecf8909541d25249373e25dc8e238ee748786c164 /mm/mm_slot.h
parent21b7bdb504ae6b0a795c8d63818611ce02b532c1 (diff)
mm: introduce common struct mm_slot
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@bytedance.com Link: https://lkml.kernel.org/r/20220831031951.43152-2-zhengqi.arch@bytedance.com Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mike Rapoport <rppt@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Yang Shi <shy828301@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mm_slot.h')
-rw-r--r--mm/mm_slot.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/mm/mm_slot.h b/mm/mm_slot.h
new file mode 100644
index 000000000000..83f18ed1c4bd
--- /dev/null
+++ b/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 */