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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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ec7b1f2dd1
Currently GC task is started for each f2fs formatted/mounted device. But, when we check the task list, using 'ps', there is no distinguishing factor between the tasks. So, name the task as per the block device just like the flusher threads. Also, remove the macro GC_THREAD_NAME and instead use the name: f2fs_gc to avoid name length truncation, as the command length is 16 -> TASK_COMM_LEN 16 and example name like: f2fs_gc_task:8:16 -> this exceeds name length Before Patch for 2 F2FS formatted partitions: root 28061 0.0 0.0 0 0 ? S 10:31 0:00 [f2fs_gc_task] root 28087 0.0 0.0 0 0 ? S 10:32 0:00 [f2fs_gc_task] After Patch: root 16756 0.0 0.0 0 0 ? S 14:57 0:00 [f2fs_gc-8:18] root 16765 0.0 0.0 0 0 ? S 14:57 0:00 [f2fs_gc-8:19] Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
/*
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* fs/f2fs/gc.h
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define GC_THREAD_MIN_WB_PAGES 1 /*
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* a threshold to determine
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* whether IO subsystem is idle
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* or not
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*/
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#define GC_THREAD_MIN_SLEEP_TIME 10000 /* milliseconds */
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#define GC_THREAD_MAX_SLEEP_TIME 30000
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#define GC_THREAD_NOGC_SLEEP_TIME 10000
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#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
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#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
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/* Search max. number of dirty segments to select a victim segment */
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#define MAX_VICTIM_SEARCH 20
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enum {
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GC_NONE = 0,
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GC_ERROR,
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GC_OK,
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GC_NEXT,
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GC_BLOCKED,
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GC_DONE,
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};
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struct f2fs_gc_kthread {
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struct task_struct *f2fs_gc_task;
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wait_queue_head_t gc_wait_queue_head;
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};
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struct inode_entry {
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struct list_head list;
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struct inode *inode;
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};
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/*
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* inline functions
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*/
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static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
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{
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if (free_segments(sbi) < overprovision_segments(sbi))
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return 0;
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else
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return (free_segments(sbi) - overprovision_segments(sbi))
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<< sbi->log_blocks_per_seg;
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}
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static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
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{
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return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
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}
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static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
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{
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block_t reclaimable_user_blocks = sbi->user_block_count -
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written_block_count(sbi);
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return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
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}
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static inline long increase_sleep_time(long wait)
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{
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wait += GC_THREAD_MIN_SLEEP_TIME;
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if (wait > GC_THREAD_MAX_SLEEP_TIME)
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wait = GC_THREAD_MAX_SLEEP_TIME;
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return wait;
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}
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static inline long decrease_sleep_time(long wait)
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{
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wait -= GC_THREAD_MIN_SLEEP_TIME;
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if (wait <= GC_THREAD_MIN_SLEEP_TIME)
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wait = GC_THREAD_MIN_SLEEP_TIME;
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return wait;
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}
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static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
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{
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block_t invalid_user_blocks = sbi->user_block_count -
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written_block_count(sbi);
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/*
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* Background GC is triggered with the following condition.
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* 1. There are a number of invalid blocks.
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* 2. There is not enough free space.
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*/
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if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
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free_user_blocks(sbi) < limit_free_user_blocks(sbi))
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return true;
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return false;
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}
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static inline int is_idle(struct f2fs_sb_info *sbi)
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{
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struct block_device *bdev = sbi->sb->s_bdev;
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struct request_queue *q = bdev_get_queue(bdev);
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struct request_list *rl = &q->root_rl;
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return !(rl->count[BLK_RW_SYNC]) && !(rl->count[BLK_RW_ASYNC]);
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}
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static inline bool should_do_checkpoint(struct f2fs_sb_info *sbi)
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{
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unsigned int pages_per_sec = sbi->segs_per_sec *
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(1 << sbi->log_blocks_per_seg);
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int node_secs = ((get_pages(sbi, F2FS_DIRTY_NODES) + pages_per_sec - 1)
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>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
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int dent_secs = ((get_pages(sbi, F2FS_DIRTY_DENTS) + pages_per_sec - 1)
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>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
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return free_sections(sbi) <= (node_secs + 2 * dent_secs + 2);
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}
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