Re: [f2fs-dev] [PATCH v2] f2fs: avoid cpu lockup

From	Chao Yu <yuchao0@huawei.com>
Newsgroups	linux.kernel
Subject	Re: [f2fs-dev] [PATCH v2] f2fs: avoid cpu lockup
Date	2017-07-18 03:50 +0200
Message-ID	<u4pO9-4ov-1@gated-at.bofh.it> (permalink)
References	<u3k4a-3a5-19@gated-at.bofh.it> <u3Gel-nJ-3@gated-at.bofh.it> <u4flN-6ht-43@gated-at.bofh.it> <u4mQh-2yQ-13@gated-at.bofh.it>
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On 2017/7/18 6:38, Jaegeuk Kim wrote:
> On 07/17, Chao Yu wrote:
>> On 2017/7/16 9:04, Jaegeuk Kim wrote:
>>> Before retrying to flush data or dentry pages, we need to release cpu in order
>>> to prevent watchdog.
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
>>
>> Reviewed-by: Chao Yu <yuchao0@huawei.com>
>>
>>> ---
>>> Change log from v1:
>>>  - timeout more specifically
>>>
>>>  fs/f2fs/checkpoint.c | 10 ++++++++++
>>>  1 file changed, 10 insertions(+)
>>>
>>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
>>> index 56bbf592e487..5b876f6d3f6b 100644
>>> --- a/fs/f2fs/checkpoint.c
>>> +++ b/fs/f2fs/checkpoint.c
>>> @@ -879,6 +879,7 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
>>>  	struct inode *inode;
>>>  	struct f2fs_inode_info *fi;
>>>  	bool is_dir = (type == DIR_INODE);
>>> +	unsigned long ino = 0;
>>>  
>>>  	trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
>>>  				get_pages(sbi, is_dir ?
>>> @@ -901,8 +902,17 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
>>>  	inode = igrab(&fi->vfs_inode);
>>>  	spin_unlock(&sbi->inode_lock[type]);
>>>  	if (inode) {
>>> +		unsigned long cur_ino = inode->i_ino;
>>> +
>>>  		filemap_fdatawrite(inode->i_mapping);
>>>  		iput(inode);
>>> +		/* We need to give cpu to another writers. */
>>> +		if (ino == cur_ino) {
>>
>> We failed to flush dirty pages of inode due to encountering -EAGAIN of writepage?
> 
> Actually, I found this from a bug case in experimental patches which just skips
> it accidently. I think WB_SYNC_ALL doesn't return EAGAIN.

Alright, thanks for explanation. :)

Thanks,

> 
> Thanks,
> 
>>
>> Thanks,
>>
>>> +			congestion_wait(BLK_RW_ASYNC, HZ/50);
>>> +			cond_resched();
>>> +		} else {
>>> +			ino = cur_ino;
>>> +		}
>>>  	} else {
>>>  		/*
>>>  		 * We should submit bio, since it exists several
>>>
> 
> .
>

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[PATCH] f2fs: avoid cpu lockup Jaegeuk Kim <jaegeuk@kernel.org> - 2017-07-15 03:30 +0200
  Re: [PATCH v2] f2fs: avoid cpu lockup Jaegeuk Kim <jaegeuk@kernel.org> - 2017-07-16 03:10 +0200
    Re: [f2fs-dev] [PATCH v2] f2fs: avoid cpu lockup Chao Yu <chao@kernel.org> - 2017-07-17 16:40 +0200
      Re: [f2fs-dev] [PATCH v2] f2fs: avoid cpu lockup Jaegeuk Kim <jaegeuk@kernel.org> - 2017-07-18 00:40 +0200
        Re: [f2fs-dev] [PATCH v2] f2fs: avoid cpu lockup Chao Yu <yuchao0@huawei.com> - 2017-07-18 03:50 +0200

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