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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>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef _LINUX_MM_SLOT_H
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#define _LINUX_MM_SLOT_H
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#include <linux/hashtable.h>
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#include <linux/slab.h>
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/*
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* struct mm_slot - hash lookup from mm to mm_slot
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* @hash: link to the mm_slots hash list
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* @mm_node: link into the mm_slots list
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* @mm: the mm that this information is valid for
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*/
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struct mm_slot {
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struct hlist_node hash;
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struct list_head mm_node;
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struct mm_struct *mm;
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};
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#define mm_slot_entry(ptr, type, member) \
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container_of(ptr, type, member)
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static inline void *mm_slot_alloc(struct kmem_cache *cache)
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{
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if (!cache) /* initialization failed */
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return NULL;
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return kmem_cache_zalloc(cache, GFP_KERNEL);
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}
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static inline void mm_slot_free(struct kmem_cache *cache, void *objp)
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{
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kmem_cache_free(cache, objp);
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}
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#define mm_slot_lookup(_hashtable, _mm) \
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({ \
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struct mm_slot *tmp_slot, *mm_slot = NULL; \
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\
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hash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \
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if (_mm == tmp_slot->mm) { \
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mm_slot = tmp_slot; \
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break; \
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} \
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\
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mm_slot; \
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})
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#define mm_slot_insert(_hashtable, _mm, _mm_slot) \
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({ \
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_mm_slot->mm = _mm; \
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hash_add(_hashtable, &_mm_slot->hash, (unsigned long)_mm); \
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})
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#endif /* _LINUX_MM_SLOT_H */
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