linux-toradex.git/fs/f2fs/gc.c, branch v4.1.18

f2fs: add stat info for moved blocks by background gc

2015-04-10T22:08:32+00:00

This patch is for looking into gc performance of f2fs in detail.

Signed-off-by: Changman Lee 
[Jaegeuk Kim: fix build errors]
Signed-off-by: Jaegeuk Kim

f2fs: split UMOUNT and FASTBOOT flags

2015-02-12T01:04:41+00:00

This patch adds FASTBOOT flag into checkpoint as follows.

 - CP_UMOUNT_FLAG is set when system is umounted.
 - CP_FASTBOOT_FLAG is set when intermediate checkpoint having node summaries
   was done.

So, if you get CP_UMOUNT_FLAG from checkpoint, the system was umounted cleanly.
Instead, if there was sudden-power-off, you can get CP_FASTBOOT_FLAG or nothing.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: clean up {in,de}create_sleep_time

2015-02-12T01:04:37+00:00

Use pointer parameter @wait to pass result in {in,de}create_sleep_time for
cleanup.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: use f2fs_radix_tree_insert to clean codes

2015-02-12T01:04:35+00:00

No modification in functionality, just clean codes with f2fs_radix_tree_insert.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: reuse inode_entry_slab in gc procedure for using slab more effectively

2015-01-10T01:02:26+00:00

There are two slab cache inode_entry_slab and winode_slab using the same
structure as below:

struct dir_inode_entry {
	struct list_head list;	/* list head */
	struct inode *inode;	/* vfs inode pointer */
};

struct inode_entry {
	struct list_head list;
	struct inode *inode;
};

It's a little waste that the two cache can not share their memory space for each
other.
So in this patch we remove one redundant winode_slab slab cache, then use more
universal name struct inode_entry as remaining data structure name of slab,
finally we reuse the inode_entry_slab to store dirty dir item and gc item for
more effective.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: do retry operations with cond_resched

2014-12-08T18:35:05+00:00

This patch revists retrial paths in f2fs.
The basic idea is to use cond_resched instead of retrying from the very early
stage.

Suggested-by: Gu Zheng 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: call radix_tree_preload before radix_tree_insert

2014-12-05T17:51:04+00:00

This patch tries to fix:

 BUG: using smp_processor_id() in preemptible [00000000] code: f2fs_gc-254:0/384
  (radix_tree_node_alloc+0x14/0x74) from [] (radix_tree_insert+0x110/0x200)
  (radix_tree_insert+0x110/0x200) from [] (gc_data_segment+0x340/0x52c)
  (gc_data_segment+0x340/0x52c) from [] (f2fs_gc+0x208/0x400)
  (f2fs_gc+0x208/0x400) from [] (gc_thread_func+0x248/0x28c)
  (gc_thread_func+0x248/0x28c) from [] (kthread+0xa0/0xac)
  (kthread+0xa0/0xac) from [] (ret_from_fork+0x14/0x3c)

The reason is that f2fs calls radix_tree_insert under enabled preemption.
So, before calling it, we need to call radix_tree_preload.

Otherwise, we should use _GFP_WAIT for the radix tree, and use mutex or
semaphore to cover the radix tree operations.

Signed-off-by: Jaegeuk Kim

f2fs: more fast lookup for gc_inode list

2014-12-02T19:02:50+00:00

If there are many inodes that have data blocks in victim segment,
it takes long time to find a inode in gc_inode list.
Let's use radix_tree to reduce lookup time.

Signed-off-by: Changman Lee 
Signed-off-by: Jaegeuk Kim

f2fs: cleanup if-statement of phase in gc_data_segment

2014-11-28T04:30:17+00:00

Little cleanup to distinguish each phase easily

Signed-off-by: Changman Lee 
[Jaegeuk Kim: modify indentation for code readability]
Signed-off-by: Jaegeuk Kim

f2fs: avoid unable to restart gc thread in remount

2014-11-20T06:49:30+00:00

In f2fs_remount, we will stop gc thread and set need_restart_gc as true when new
option is set without BG_GC, then if any error occurred in the following
procedure, we can restore to start the gc thread.
But after that, We will fail to restore gc thread in start_gc_thread as BG_GC is
not set in new option, so we'd better move this condition judgment out of
start_gc_thread to fix this issue.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim