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839195352d
Commit e900a918b0 ("mm: shuffle initial free memory to improve
memory-side-cache utilization") promised "autodetection of a
memory-side-cache (to be added in a follow-on patch)" over a year ago.
The original series included patches [1], however, they were dropped
during review [2] to be followed-up later.
Due to lack of platforms that publish an HMAT, autodetection is currently
not implemented. However, manual activation is actively used [3]. Let's
simplify for now and re-add when really (ever?) needed.
[1] https://lkml.kernel.org/r/154510700291.1941238.817190985966612531.stgit@dwillia2-desk3.amr.corp.intel.com
[2] https://lkml.kernel.org/r/154690326478.676627.103843791978176914.stgit@dwillia2-desk3.amr.corp.intel.com
[3] https://lkml.kernel.org/r/CAPcyv4irwGUU2x+c6b4L=KbB1dnasNKaaZd6oSpYjL9kfsnROQ@mail.gmail.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: http://lkml.kernel.org/r/20200624094741.9918-4-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright(c) 2018 Intel Corporation. All rights reserved.
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#ifndef _MM_SHUFFLE_H
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#define _MM_SHUFFLE_H
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#include <linux/jump_label.h>
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#define SHUFFLE_ORDER (MAX_ORDER-1)
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#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
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DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
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extern void __shuffle_free_memory(pg_data_t *pgdat);
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extern bool shuffle_pick_tail(void);
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static inline void shuffle_free_memory(pg_data_t *pgdat)
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{
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if (!static_branch_unlikely(&page_alloc_shuffle_key))
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return;
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__shuffle_free_memory(pgdat);
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}
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extern void __shuffle_zone(struct zone *z);
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static inline void shuffle_zone(struct zone *z)
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{
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if (!static_branch_unlikely(&page_alloc_shuffle_key))
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return;
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__shuffle_zone(z);
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}
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static inline bool is_shuffle_order(int order)
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{
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if (!static_branch_unlikely(&page_alloc_shuffle_key))
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return false;
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return order >= SHUFFLE_ORDER;
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}
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#else
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static inline bool shuffle_pick_tail(void)
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{
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return false;
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}
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static inline void shuffle_free_memory(pg_data_t *pgdat)
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{
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}
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static inline void shuffle_zone(struct zone *z)
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{
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}
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static inline bool is_shuffle_order(int order)
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{
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return false;
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}
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#endif
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#endif /* _MM_SHUFFLE_H */
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