From e4544b63a7ee49e7fbebf35ece0a6acd3b9617ae Mon Sep 17 00:00:00 2001 From: Tim Murray Date: Fri, 7 Jan 2022 12:48:44 -0800 Subject: f2fs: move f2fs to use reader-unfair rwsems f2fs rw_semaphores work better if writers can starve readers, especially for the checkpoint thread, because writers are strictly more important than reader threads. This prevents significant priority inversion between low-priority readers that blocked while trying to acquire the read lock and a second acquisition of the write lock that might be blocking high priority work. Signed-off-by: Tim Murray Signed-off-by: Jaegeuk Kim --- fs/f2fs/segment.c | 44 ++++++++++++++++++++++---------------------- 1 file changed, 22 insertions(+), 22 deletions(-) (limited to 'fs/f2fs/segment.c') diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 1dabc8244083..216538b57331 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -471,7 +471,7 @@ int f2fs_commit_inmem_pages(struct inode *inode) f2fs_balance_fs(sbi, true); - down_write(&fi->i_gc_rwsem[WRITE]); + f2fs_down_write(&fi->i_gc_rwsem[WRITE]); f2fs_lock_op(sbi); set_inode_flag(inode, FI_ATOMIC_COMMIT); @@ -483,7 +483,7 @@ int f2fs_commit_inmem_pages(struct inode *inode) clear_inode_flag(inode, FI_ATOMIC_COMMIT); f2fs_unlock_op(sbi); - up_write(&fi->i_gc_rwsem[WRITE]); + f2fs_up_write(&fi->i_gc_rwsem[WRITE]); return err; } @@ -521,7 +521,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need) io_schedule(); finish_wait(&sbi->gc_thread->fggc_wq, &wait); } else { - down_write(&sbi->gc_lock); + f2fs_down_write(&sbi->gc_lock); f2fs_gc(sbi, false, false, false, NULL_SEGNO); } } @@ -529,7 +529,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need) static inline bool excess_dirty_threshold(struct f2fs_sb_info *sbi) { - int factor = rwsem_is_locked(&sbi->cp_rwsem) ? 3 : 2; + int factor = f2fs_rwsem_is_locked(&sbi->cp_rwsem) ? 3 : 2; unsigned int dents = get_pages(sbi, F2FS_DIRTY_DENTS); unsigned int qdata = get_pages(sbi, F2FS_DIRTY_QDATA); unsigned int nodes = get_pages(sbi, F2FS_DIRTY_NODES); @@ -570,7 +570,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg) /* there is background inflight IO or foreground operation recently */ if (is_inflight_io(sbi, REQ_TIME) || - (!f2fs_time_over(sbi, REQ_TIME) && rwsem_is_locked(&sbi->cp_rwsem))) + (!f2fs_time_over(sbi, REQ_TIME) && f2fs_rwsem_is_locked(&sbi->cp_rwsem))) return; /* exceed periodical checkpoint timeout threshold */ @@ -2821,7 +2821,7 @@ static void __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi) if (!sbi->am.atgc_enabled) return; - down_read(&SM_I(sbi)->curseg_lock); + f2fs_down_read(&SM_I(sbi)->curseg_lock); mutex_lock(&curseg->curseg_mutex); down_write(&SIT_I(sbi)->sentry_lock); @@ -2831,7 +2831,7 @@ static void __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi) up_write(&SIT_I(sbi)->sentry_lock); mutex_unlock(&curseg->curseg_mutex); - up_read(&SM_I(sbi)->curseg_lock); + f2fs_up_read(&SM_I(sbi)->curseg_lock); } void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi) @@ -2982,7 +2982,7 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type, struct curseg_info *curseg = CURSEG_I(sbi, type); unsigned int segno; - down_read(&SM_I(sbi)->curseg_lock); + f2fs_down_read(&SM_I(sbi)->curseg_lock); mutex_lock(&curseg->curseg_mutex); down_write(&SIT_I(sbi)->sentry_lock); @@ -3006,7 +3006,7 @@ unlock: type, segno, curseg->segno); mutex_unlock(&curseg->curseg_mutex); - up_read(&SM_I(sbi)->curseg_lock); + f2fs_up_read(&SM_I(sbi)->curseg_lock); } static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type, @@ -3038,23 +3038,23 @@ static void __allocate_new_section(struct f2fs_sb_info *sbi, void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force) { - down_read(&SM_I(sbi)->curseg_lock); + f2fs_down_read(&SM_I(sbi)->curseg_lock); down_write(&SIT_I(sbi)->sentry_lock); __allocate_new_section(sbi, type, force); up_write(&SIT_I(sbi)->sentry_lock); - up_read(&SM_I(sbi)->curseg_lock); + f2fs_up_read(&SM_I(sbi)->curseg_lock); } void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi) { int i; - down_read(&SM_I(sbi)->curseg_lock); + f2fs_down_read(&SM_I(sbi)->curseg_lock); down_write(&SIT_I(sbi)->sentry_lock); for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) __allocate_new_segment(sbi, i, false, false); up_write(&SIT_I(sbi)->sentry_lock); - up_read(&SM_I(sbi)->curseg_lock); + f2fs_up_read(&SM_I(sbi)->curseg_lock); } static const struct segment_allocation default_salloc_ops = { @@ -3192,9 +3192,9 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range) if (sbi->discard_blks == 0) goto out; - down_write(&sbi->gc_lock); + f2fs_down_write(&sbi->gc_lock); err = f2fs_write_checkpoint(sbi, &cpc); - up_write(&sbi->gc_lock); + f2fs_up_write(&sbi->gc_lock); if (err) goto out; @@ -3431,7 +3431,7 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, bool from_gc = (type == CURSEG_ALL_DATA_ATGC); struct seg_entry *se = NULL; - down_read(&SM_I(sbi)->curseg_lock); + f2fs_down_read(&SM_I(sbi)->curseg_lock); mutex_lock(&curseg->curseg_mutex); down_write(&sit_i->sentry_lock); @@ -3514,7 +3514,7 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, mutex_unlock(&curseg->curseg_mutex); - up_read(&SM_I(sbi)->curseg_lock); + f2fs_up_read(&SM_I(sbi)->curseg_lock); } void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino, @@ -3550,7 +3550,7 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio) bool keep_order = (f2fs_lfs_mode(fio->sbi) && type == CURSEG_COLD_DATA); if (keep_order) - down_read(&fio->sbi->io_order_lock); + f2fs_down_read(&fio->sbi->io_order_lock); reallocate: f2fs_allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr, &fio->new_blkaddr, sum, type, fio); @@ -3570,7 +3570,7 @@ reallocate: f2fs_update_device_state(fio->sbi, fio->ino, fio->new_blkaddr, 1); if (keep_order) - up_read(&fio->sbi->io_order_lock); + f2fs_up_read(&fio->sbi->io_order_lock); } void f2fs_do_write_meta_page(struct f2fs_sb_info *sbi, struct page *page, @@ -3705,7 +3705,7 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, se = get_seg_entry(sbi, segno); type = se->type; - down_write(&SM_I(sbi)->curseg_lock); + f2fs_down_write(&SM_I(sbi)->curseg_lock); if (!recover_curseg) { /* for recovery flow */ @@ -3774,7 +3774,7 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, up_write(&sit_i->sentry_lock); mutex_unlock(&curseg->curseg_mutex); - up_write(&SM_I(sbi)->curseg_lock); + f2fs_up_write(&SM_I(sbi)->curseg_lock); } void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn, @@ -5258,7 +5258,7 @@ int f2fs_build_segment_manager(struct f2fs_sb_info *sbi) INIT_LIST_HEAD(&sm_info->sit_entry_set); - init_rwsem(&sm_info->curseg_lock); + init_f2fs_rwsem(&sm_info->curseg_lock); if (!f2fs_readonly(sbi->sb)) { err = f2fs_create_flush_cmd_control(sbi); 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