Messages in this thread Patch in this message | | | Subject | [PATCH 4/4] ext3 block reservation patch set -- dynamically increase reservation window | From | Mingming Cao <> | Date | 13 Apr 2004 18:00:27 -0700 |
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> [patch 4]ext3_rsv_dw.patch: adjust the reservation window size > dynamically: > Start from the deault reservation window size, if the hit ration of > the reservation window is more than 50%, we will double the reservation > window size next time up to a certain upper limit.
diffstat ext3_rsv_dw.patch fs/ext3/balloc.c | 13 ++++++++++++- fs/ext3/ialloc.c | 3 ++- fs/ext3/super.c | 1 + include/linux/ext3_fs_i.h | 1 + 4 files changed, 16 insertions(+), 2 deletions(-)
diff -urNp 264-rsv-cleanup-base-mount/fs/ext3/balloc.c 264-rsv-cleanup-base-mount-dw/fs/ext3/balloc.c --- 264-rsv-cleanup-base-mount/fs/ext3/balloc.c 2004-04-13 01:44:50.091477008 -0700 +++ 264-rsv-cleanup-base-mount-dw/fs/ext3/balloc.c 2004-04-12 22:15:12.128618008 -0700 @@ -148,6 +148,7 @@ static inline void rsv_window_remove(str { rsv->rsv_start = 0; rsv->rsv_end = 0; + rsv->rsv_alloc_hit = 0; list_del(&rsv->rsv_list); INIT_LIST_HEAD(&rsv->rsv_list); } @@ -548,7 +549,8 @@ repeat: goto fail_access; goto repeat; } - + if (my_rsv) + my_rsv->rsv_alloc_hit++; return goal; fail_access: return -1; @@ -731,6 +733,15 @@ static int alloc_new_reservation(struct start_block = my_rsv->rsv_end + 1; search_head = list_entry(my_rsv->rsv_list.prev, struct reserve_window, rsv_list); + if ((my_rsv->rsv_alloc_hit > (my_rsv->rsv_end - my_rsv->rsv_start + 1) / 2)) { + /* + * if we previously allocation hit ration is greater than half + * we double the size of reservation window next time + * otherwise keep the same + */ + size = size * 2; + atomic_set(&my_rsv->rsv_goal_size, size); + } rsv_window_remove(my_rsv); } else { diff -urNp 264-rsv-cleanup-base-mount/fs/ext3/ialloc.c 264-rsv-cleanup-base-mount-dw/fs/ext3/ialloc.c --- 264-rsv-cleanup-base-mount/fs/ext3/ialloc.c 2004-04-10 01:19:52.705503744 -0700 +++ 264-rsv-cleanup-base-mount-dw/fs/ext3/ialloc.c 2004-04-12 21:46:19.443026256 -0700 @@ -583,8 +583,9 @@ got: ei->i_dir_acl = 0; ei->i_dtime = 0; ei->i_rsv_window.rsv_start = 0; - ei->i_rsv_window.rsv_end= 0; + ei->i_rsv_window.rsv_end = 0; atomic_set(&ei->i_rsv_window.rsv_goal_size, EXT3_DEFAULT_RESERVE_BLOCKS); + ei->i_rsv_window.rsv_alloc_hit = 0; INIT_LIST_HEAD(&ei->i_rsv_window.rsv_list); ei->i_block_group = group; diff -urNp 264-rsv-cleanup-base-mount/fs/ext3/super.c 264-rsv-cleanup-base-mount-dw/fs/ext3/super.c --- 264-rsv-cleanup-base-mount/fs/ext3/super.c 2004-04-10 01:19:52.719501616 -0700 +++ 264-rsv-cleanup-base-mount-dw/fs/ext3/super.c 2004-04-12 21:47:00.612767504 -0700 @@ -1312,6 +1312,7 @@ static int ext3_fill_super (struct super INIT_LIST_HEAD(&sbi->s_rsv_window_head.rsv_list); sbi->s_rsv_window_head.rsv_start = 0; sbi->s_rsv_window_head.rsv_end = 0; + sbi->s_rsv_window_head.rsv_alloc_hit = 0; atomic_set(&sbi->s_rsv_window_head.rsv_goal_size, 0); /* diff -urNp 264-rsv-cleanup-base-mount/include/linux/ext3_fs_i.h 264-rsv-cleanup-base-mount-dw/include/linux/ext3_fs_i.h --- 264-rsv-cleanup-base-mount/include/linux/ext3_fs_i.h 2004-04-10 01:19:52.723501008 -0700 +++ 264-rsv-cleanup-base-mount-dw/include/linux/ext3_fs_i.h 2004-04-12 21:43:25.019542656 -0700 @@ -23,6 +23,7 @@ struct reserve_window{ __u32 rsv_start; __u32 rsv_end; atomic_t rsv_goal_size; + __u32 rsv_alloc_hit; }; /* | |