percpu: move fully free chunk reclamation into a work
Impact: code reorganization for later changes Do fully free chunk reclamation using a work. This change is to prepare for locking changes. Signed-off-by: Tejun Heo <tj@kernel.org>
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42
mm/percpu.c
42
mm/percpu.c
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@ -63,6 +63,7 @@
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/workqueue.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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@ -118,6 +119,10 @@ static DEFINE_MUTEX(pcpu_mutex);
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static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */
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static struct rb_root pcpu_addr_root = RB_ROOT; /* chunks by address */
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/* reclaim work to release fully free chunks, scheduled from free path */
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static void pcpu_reclaim(struct work_struct *work);
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static DECLARE_WORK(pcpu_reclaim_work, pcpu_reclaim);
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static int __pcpu_size_to_slot(int size)
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{
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int highbit = fls(size); /* size is in bytes */
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@ -846,14 +851,38 @@ void *__alloc_reserved_percpu(size_t size, size_t align)
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return pcpu_alloc(size, align, true);
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}
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static void pcpu_kill_chunk(struct pcpu_chunk *chunk)
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/**
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* pcpu_reclaim - reclaim fully free chunks, workqueue function
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* @work: unused
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*
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* Reclaim all fully free chunks except for the first one.
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*/
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static void pcpu_reclaim(struct work_struct *work)
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{
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LIST_HEAD(todo);
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struct list_head *head = &pcpu_slot[pcpu_nr_slots - 1];
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struct pcpu_chunk *chunk, *next;
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mutex_lock(&pcpu_mutex);
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list_for_each_entry_safe(chunk, next, head, list) {
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WARN_ON(chunk->immutable);
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pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size, false);
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list_del(&chunk->list);
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/* spare the first one */
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if (chunk == list_first_entry(head, struct pcpu_chunk, list))
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continue;
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rb_erase(&chunk->rb_node, &pcpu_addr_root);
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list_move(&chunk->list, &todo);
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}
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mutex_unlock(&pcpu_mutex);
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list_for_each_entry_safe(chunk, next, &todo, list) {
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pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size, false);
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free_pcpu_chunk(chunk);
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}
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}
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/**
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* free_percpu - free percpu area
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@ -877,14 +906,13 @@ void free_percpu(void *ptr)
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pcpu_free_area(chunk, off);
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/* the chunk became fully free, kill one if there are other free ones */
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/* if there are more than one fully free chunks, wake up grim reaper */
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if (chunk->free_size == pcpu_unit_size) {
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struct pcpu_chunk *pos;
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list_for_each_entry(pos,
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&pcpu_slot[pcpu_chunk_slot(chunk)], list)
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list_for_each_entry(pos, &pcpu_slot[pcpu_nr_slots - 1], list)
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if (pos != chunk) {
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pcpu_kill_chunk(pos);
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schedule_work(&pcpu_reclaim_work);
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break;
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}
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}
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