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![Shenghui Wang](/assets/img/avatar_default.png)
"sbitmap_batch_clear" should be "sbitmap_deferred_clear" Acked-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Shenghui Wang <shhuiw@foxmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
603 lines
17 KiB
C
603 lines
17 KiB
C
/*
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* Fast and scalable bitmaps.
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*
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* Copyright (C) 2016 Facebook
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* Copyright (C) 2013-2014 Jens Axboe
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __LINUX_SCALE_BITMAP_H
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#define __LINUX_SCALE_BITMAP_H
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#include <linux/kernel.h>
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#include <linux/slab.h>
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struct seq_file;
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/**
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* struct sbitmap_word - Word in a &struct sbitmap.
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*/
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struct sbitmap_word {
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/**
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* @depth: Number of bits being used in @word/@cleared
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*/
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unsigned long depth;
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/**
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* @word: word holding free bits
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*/
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unsigned long word ____cacheline_aligned_in_smp;
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/**
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* @cleared: word holding cleared bits
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*/
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unsigned long cleared ____cacheline_aligned_in_smp;
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/**
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* @swap_lock: Held while swapping word <-> cleared
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*/
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spinlock_t swap_lock;
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} ____cacheline_aligned_in_smp;
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/**
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* struct sbitmap - Scalable bitmap.
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*
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* A &struct sbitmap is spread over multiple cachelines to avoid ping-pong. This
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* trades off higher memory usage for better scalability.
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*/
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struct sbitmap {
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/**
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* @depth: Number of bits used in the whole bitmap.
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*/
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unsigned int depth;
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/**
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* @shift: log2(number of bits used per word)
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*/
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unsigned int shift;
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/**
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* @map_nr: Number of words (cachelines) being used for the bitmap.
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*/
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unsigned int map_nr;
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/**
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* @map: Allocated bitmap.
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*/
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struct sbitmap_word *map;
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};
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#define SBQ_WAIT_QUEUES 8
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#define SBQ_WAKE_BATCH 8
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/**
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* struct sbq_wait_state - Wait queue in a &struct sbitmap_queue.
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*/
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struct sbq_wait_state {
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/**
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* @wait_cnt: Number of frees remaining before we wake up.
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*/
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atomic_t wait_cnt;
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/**
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* @wait: Wait queue.
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*/
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wait_queue_head_t wait;
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} ____cacheline_aligned_in_smp;
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/**
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* struct sbitmap_queue - Scalable bitmap with the added ability to wait on free
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* bits.
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*
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* A &struct sbitmap_queue uses multiple wait queues and rolling wakeups to
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* avoid contention on the wait queue spinlock. This ensures that we don't hit a
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* scalability wall when we run out of free bits and have to start putting tasks
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* to sleep.
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*/
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struct sbitmap_queue {
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/**
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* @sb: Scalable bitmap.
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*/
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struct sbitmap sb;
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/*
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* @alloc_hint: Cache of last successfully allocated or freed bit.
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*
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* This is per-cpu, which allows multiple users to stick to different
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* cachelines until the map is exhausted.
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*/
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unsigned int __percpu *alloc_hint;
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/**
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* @wake_batch: Number of bits which must be freed before we wake up any
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* waiters.
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*/
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unsigned int wake_batch;
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/**
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* @wake_index: Next wait queue in @ws to wake up.
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*/
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atomic_t wake_index;
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/**
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* @ws: Wait queues.
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*/
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struct sbq_wait_state *ws;
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/*
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* @ws_active: count of currently active ws waitqueues
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*/
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atomic_t ws_active;
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/**
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* @round_robin: Allocate bits in strict round-robin order.
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*/
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bool round_robin;
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/**
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* @min_shallow_depth: The minimum shallow depth which may be passed to
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* sbitmap_queue_get_shallow() or __sbitmap_queue_get_shallow().
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*/
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unsigned int min_shallow_depth;
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};
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/**
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* sbitmap_init_node() - Initialize a &struct sbitmap on a specific memory node.
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* @sb: Bitmap to initialize.
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* @depth: Number of bits to allocate.
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* @shift: Use 2^@shift bits per word in the bitmap; if a negative number if
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* given, a good default is chosen.
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* @flags: Allocation flags.
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* @node: Memory node to allocate on.
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*
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* Return: Zero on success or negative errno on failure.
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*/
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int sbitmap_init_node(struct sbitmap *sb, unsigned int depth, int shift,
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gfp_t flags, int node);
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/**
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* sbitmap_free() - Free memory used by a &struct sbitmap.
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* @sb: Bitmap to free.
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*/
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static inline void sbitmap_free(struct sbitmap *sb)
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{
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kfree(sb->map);
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sb->map = NULL;
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}
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/**
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* sbitmap_resize() - Resize a &struct sbitmap.
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* @sb: Bitmap to resize.
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* @depth: New number of bits to resize to.
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*
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* Doesn't reallocate anything. It's up to the caller to ensure that the new
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* depth doesn't exceed the depth that the sb was initialized with.
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*/
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void sbitmap_resize(struct sbitmap *sb, unsigned int depth);
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/**
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* sbitmap_get() - Try to allocate a free bit from a &struct sbitmap.
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* @sb: Bitmap to allocate from.
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* @alloc_hint: Hint for where to start searching for a free bit.
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* @round_robin: If true, be stricter about allocation order; always allocate
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* starting from the last allocated bit. This is less efficient
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* than the default behavior (false).
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*
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* This operation provides acquire barrier semantics if it succeeds.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int sbitmap_get(struct sbitmap *sb, unsigned int alloc_hint, bool round_robin);
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/**
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* sbitmap_get_shallow() - Try to allocate a free bit from a &struct sbitmap,
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* limiting the depth used from each word.
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* @sb: Bitmap to allocate from.
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* @alloc_hint: Hint for where to start searching for a free bit.
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* @shallow_depth: The maximum number of bits to allocate from a single word.
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*
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* This rather specific operation allows for having multiple users with
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* different allocation limits. E.g., there can be a high-priority class that
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* uses sbitmap_get() and a low-priority class that uses sbitmap_get_shallow()
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* with a @shallow_depth of (1 << (@sb->shift - 1)). Then, the low-priority
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* class can only allocate half of the total bits in the bitmap, preventing it
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* from starving out the high-priority class.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int sbitmap_get_shallow(struct sbitmap *sb, unsigned int alloc_hint,
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unsigned long shallow_depth);
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/**
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* sbitmap_any_bit_set() - Check for a set bit in a &struct sbitmap.
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* @sb: Bitmap to check.
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*
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* Return: true if any bit in the bitmap is set, false otherwise.
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*/
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bool sbitmap_any_bit_set(const struct sbitmap *sb);
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/**
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* sbitmap_any_bit_clear() - Check for an unset bit in a &struct
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* sbitmap.
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* @sb: Bitmap to check.
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*
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* Return: true if any bit in the bitmap is clear, false otherwise.
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*/
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bool sbitmap_any_bit_clear(const struct sbitmap *sb);
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#define SB_NR_TO_INDEX(sb, bitnr) ((bitnr) >> (sb)->shift)
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#define SB_NR_TO_BIT(sb, bitnr) ((bitnr) & ((1U << (sb)->shift) - 1U))
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typedef bool (*sb_for_each_fn)(struct sbitmap *, unsigned int, void *);
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/**
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* __sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap.
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* @start: Where to start the iteration.
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* @sb: Bitmap to iterate over.
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* @fn: Callback. Should return true to continue or false to break early.
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* @data: Pointer to pass to callback.
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*
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* This is inline even though it's non-trivial so that the function calls to the
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* callback will hopefully get optimized away.
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*/
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static inline void __sbitmap_for_each_set(struct sbitmap *sb,
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unsigned int start,
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sb_for_each_fn fn, void *data)
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{
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unsigned int index;
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unsigned int nr;
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unsigned int scanned = 0;
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if (start >= sb->depth)
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start = 0;
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index = SB_NR_TO_INDEX(sb, start);
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nr = SB_NR_TO_BIT(sb, start);
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while (scanned < sb->depth) {
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unsigned long word;
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unsigned int depth = min_t(unsigned int,
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sb->map[index].depth - nr,
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sb->depth - scanned);
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scanned += depth;
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word = sb->map[index].word & ~sb->map[index].cleared;
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if (!word)
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goto next;
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/*
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* On the first iteration of the outer loop, we need to add the
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* bit offset back to the size of the word for find_next_bit().
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* On all other iterations, nr is zero, so this is a noop.
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*/
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depth += nr;
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while (1) {
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nr = find_next_bit(&word, depth, nr);
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if (nr >= depth)
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break;
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if (!fn(sb, (index << sb->shift) + nr, data))
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return;
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nr++;
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}
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next:
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nr = 0;
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if (++index >= sb->map_nr)
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index = 0;
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}
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}
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/**
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* sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap.
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* @sb: Bitmap to iterate over.
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* @fn: Callback. Should return true to continue or false to break early.
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* @data: Pointer to pass to callback.
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*/
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static inline void sbitmap_for_each_set(struct sbitmap *sb, sb_for_each_fn fn,
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void *data)
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{
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__sbitmap_for_each_set(sb, 0, fn, data);
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}
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static inline unsigned long *__sbitmap_word(struct sbitmap *sb,
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unsigned int bitnr)
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{
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return &sb->map[SB_NR_TO_INDEX(sb, bitnr)].word;
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}
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/* Helpers equivalent to the operations in asm/bitops.h and linux/bitmap.h */
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static inline void sbitmap_set_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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set_bit(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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static inline void sbitmap_clear_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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clear_bit(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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/*
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* This one is special, since it doesn't actually clear the bit, rather it
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* sets the corresponding bit in the ->cleared mask instead. Paired with
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* the caller doing sbitmap_deferred_clear() if a given index is full, which
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* will clear the previously freed entries in the corresponding ->word.
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*/
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static inline void sbitmap_deferred_clear_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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unsigned long *addr = &sb->map[SB_NR_TO_INDEX(sb, bitnr)].cleared;
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set_bit(SB_NR_TO_BIT(sb, bitnr), addr);
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}
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static inline void sbitmap_clear_bit_unlock(struct sbitmap *sb,
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unsigned int bitnr)
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{
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clear_bit_unlock(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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static inline int sbitmap_test_bit(struct sbitmap *sb, unsigned int bitnr)
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{
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return test_bit(SB_NR_TO_BIT(sb, bitnr), __sbitmap_word(sb, bitnr));
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}
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/**
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* sbitmap_show() - Dump &struct sbitmap information to a &struct seq_file.
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* @sb: Bitmap to show.
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* @m: struct seq_file to write to.
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*
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* This is intended for debugging. The format may change at any time.
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*/
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void sbitmap_show(struct sbitmap *sb, struct seq_file *m);
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/**
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* sbitmap_bitmap_show() - Write a hex dump of a &struct sbitmap to a &struct
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* seq_file.
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* @sb: Bitmap to show.
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* @m: struct seq_file to write to.
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*
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* This is intended for debugging. The output isn't guaranteed to be internally
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* consistent.
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*/
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void sbitmap_bitmap_show(struct sbitmap *sb, struct seq_file *m);
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/**
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* sbitmap_queue_init_node() - Initialize a &struct sbitmap_queue on a specific
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* memory node.
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* @sbq: Bitmap queue to initialize.
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* @depth: See sbitmap_init_node().
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* @shift: See sbitmap_init_node().
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* @round_robin: See sbitmap_get().
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* @flags: Allocation flags.
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* @node: Memory node to allocate on.
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*
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* Return: Zero on success or negative errno on failure.
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*/
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int sbitmap_queue_init_node(struct sbitmap_queue *sbq, unsigned int depth,
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int shift, bool round_robin, gfp_t flags, int node);
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/**
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* sbitmap_queue_free() - Free memory used by a &struct sbitmap_queue.
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*
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* @sbq: Bitmap queue to free.
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*/
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static inline void sbitmap_queue_free(struct sbitmap_queue *sbq)
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{
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kfree(sbq->ws);
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free_percpu(sbq->alloc_hint);
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sbitmap_free(&sbq->sb);
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}
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/**
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* sbitmap_queue_resize() - Resize a &struct sbitmap_queue.
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* @sbq: Bitmap queue to resize.
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* @depth: New number of bits to resize to.
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*
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* Like sbitmap_resize(), this doesn't reallocate anything. It has to do
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* some extra work on the &struct sbitmap_queue, so it's not safe to just
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* resize the underlying &struct sbitmap.
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*/
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void sbitmap_queue_resize(struct sbitmap_queue *sbq, unsigned int depth);
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/**
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* __sbitmap_queue_get() - Try to allocate a free bit from a &struct
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* sbitmap_queue with preemption already disabled.
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* @sbq: Bitmap queue to allocate from.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int __sbitmap_queue_get(struct sbitmap_queue *sbq);
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/**
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* __sbitmap_queue_get_shallow() - Try to allocate a free bit from a &struct
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* sbitmap_queue, limiting the depth used from each word, with preemption
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* already disabled.
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* @sbq: Bitmap queue to allocate from.
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* @shallow_depth: The maximum number of bits to allocate from a single word.
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* See sbitmap_get_shallow().
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*
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* If you call this, make sure to call sbitmap_queue_min_shallow_depth() after
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* initializing @sbq.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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int __sbitmap_queue_get_shallow(struct sbitmap_queue *sbq,
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unsigned int shallow_depth);
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/**
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* sbitmap_queue_get() - Try to allocate a free bit from a &struct
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* sbitmap_queue.
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* @sbq: Bitmap queue to allocate from.
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* @cpu: Output parameter; will contain the CPU we ran on (e.g., to be passed to
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* sbitmap_queue_clear()).
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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static inline int sbitmap_queue_get(struct sbitmap_queue *sbq,
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unsigned int *cpu)
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{
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int nr;
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*cpu = get_cpu();
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nr = __sbitmap_queue_get(sbq);
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put_cpu();
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return nr;
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}
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/**
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* sbitmap_queue_get_shallow() - Try to allocate a free bit from a &struct
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* sbitmap_queue, limiting the depth used from each word.
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* @sbq: Bitmap queue to allocate from.
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* @cpu: Output parameter; will contain the CPU we ran on (e.g., to be passed to
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* sbitmap_queue_clear()).
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* @shallow_depth: The maximum number of bits to allocate from a single word.
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* See sbitmap_get_shallow().
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*
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* If you call this, make sure to call sbitmap_queue_min_shallow_depth() after
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* initializing @sbq.
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*
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* Return: Non-negative allocated bit number if successful, -1 otherwise.
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*/
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static inline int sbitmap_queue_get_shallow(struct sbitmap_queue *sbq,
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unsigned int *cpu,
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unsigned int shallow_depth)
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{
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int nr;
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*cpu = get_cpu();
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nr = __sbitmap_queue_get_shallow(sbq, shallow_depth);
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put_cpu();
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return nr;
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}
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/**
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* sbitmap_queue_min_shallow_depth() - Inform a &struct sbitmap_queue of the
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* minimum shallow depth that will be used.
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* @sbq: Bitmap queue in question.
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* @min_shallow_depth: The minimum shallow depth that will be passed to
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* sbitmap_queue_get_shallow() or __sbitmap_queue_get_shallow().
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*
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* sbitmap_queue_clear() batches wakeups as an optimization. The batch size
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* depends on the depth of the bitmap. Since the shallow allocation functions
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* effectively operate with a different depth, the shallow depth must be taken
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* into account when calculating the batch size. This function must be called
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* with the minimum shallow depth that will be used. Failure to do so can result
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* in missed wakeups.
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*/
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void sbitmap_queue_min_shallow_depth(struct sbitmap_queue *sbq,
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unsigned int min_shallow_depth);
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/**
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* sbitmap_queue_clear() - Free an allocated bit and wake up waiters on a
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* &struct sbitmap_queue.
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* @sbq: Bitmap to free from.
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* @nr: Bit number to free.
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* @cpu: CPU the bit was allocated on.
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|
*/
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void sbitmap_queue_clear(struct sbitmap_queue *sbq, unsigned int nr,
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unsigned int cpu);
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static inline int sbq_index_inc(int index)
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|
{
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return (index + 1) & (SBQ_WAIT_QUEUES - 1);
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|
}
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|
|
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static inline void sbq_index_atomic_inc(atomic_t *index)
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|
{
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|
int old = atomic_read(index);
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int new = sbq_index_inc(old);
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atomic_cmpxchg(index, old, new);
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|
}
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|
|
|
/**
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|
* sbq_wait_ptr() - Get the next wait queue to use for a &struct
|
|
* sbitmap_queue.
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* @sbq: Bitmap queue to wait on.
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* @wait_index: A counter per "user" of @sbq.
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|
*/
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|
static inline struct sbq_wait_state *sbq_wait_ptr(struct sbitmap_queue *sbq,
|
|
atomic_t *wait_index)
|
|
{
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|
struct sbq_wait_state *ws;
|
|
|
|
ws = &sbq->ws[atomic_read(wait_index)];
|
|
sbq_index_atomic_inc(wait_index);
|
|
return ws;
|
|
}
|
|
|
|
/**
|
|
* sbitmap_queue_wake_all() - Wake up everything waiting on a &struct
|
|
* sbitmap_queue.
|
|
* @sbq: Bitmap queue to wake up.
|
|
*/
|
|
void sbitmap_queue_wake_all(struct sbitmap_queue *sbq);
|
|
|
|
/**
|
|
* sbitmap_queue_wake_up() - Wake up some of waiters in one waitqueue
|
|
* on a &struct sbitmap_queue.
|
|
* @sbq: Bitmap queue to wake up.
|
|
*/
|
|
void sbitmap_queue_wake_up(struct sbitmap_queue *sbq);
|
|
|
|
/**
|
|
* sbitmap_queue_show() - Dump &struct sbitmap_queue information to a &struct
|
|
* seq_file.
|
|
* @sbq: Bitmap queue to show.
|
|
* @m: struct seq_file to write to.
|
|
*
|
|
* This is intended for debugging. The format may change at any time.
|
|
*/
|
|
void sbitmap_queue_show(struct sbitmap_queue *sbq, struct seq_file *m);
|
|
|
|
struct sbq_wait {
|
|
struct sbitmap_queue *sbq; /* if set, sbq_wait is accounted */
|
|
struct wait_queue_entry wait;
|
|
};
|
|
|
|
#define DEFINE_SBQ_WAIT(name) \
|
|
struct sbq_wait name = { \
|
|
.sbq = NULL, \
|
|
.wait = { \
|
|
.private = current, \
|
|
.func = autoremove_wake_function, \
|
|
.entry = LIST_HEAD_INIT((name).wait.entry), \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* Wrapper around prepare_to_wait_exclusive(), which maintains some extra
|
|
* internal state.
|
|
*/
|
|
void sbitmap_prepare_to_wait(struct sbitmap_queue *sbq,
|
|
struct sbq_wait_state *ws,
|
|
struct sbq_wait *sbq_wait, int state);
|
|
|
|
/*
|
|
* Must be paired with sbitmap_prepare_to_wait().
|
|
*/
|
|
void sbitmap_finish_wait(struct sbitmap_queue *sbq, struct sbq_wait_state *ws,
|
|
struct sbq_wait *sbq_wait);
|
|
|
|
/*
|
|
* Wrapper around add_wait_queue(), which maintains some extra internal state
|
|
*/
|
|
void sbitmap_add_wait_queue(struct sbitmap_queue *sbq,
|
|
struct sbq_wait_state *ws,
|
|
struct sbq_wait *sbq_wait);
|
|
|
|
/*
|
|
* Must be paired with sbitmap_add_wait_queue()
|
|
*/
|
|
void sbitmap_del_wait_queue(struct sbq_wait *sbq_wait);
|
|
|
|
#endif /* __LINUX_SCALE_BITMAP_H */
|