From: Josef Bacik <josef@toxicpanda.com>
To: dsterba@suse.cz, linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH 00/23] Change data reservations to use the ticketing infra
Date: Tue, 7 Jul 2020 11:28:33 -0400 [thread overview]
Message-ID: <f44431f1-52ea-93ac-0cd0-8db9ae6500e4@toxicpanda.com> (raw)
In-Reply-To: <20200703163028.GG27795@twin.jikos.cz>
On 7/3/20 12:30 PM, David Sterba wrote:
> On Tue, Jun 30, 2020 at 09:58:58AM -0400, Josef Bacik wrote:
>> We've had two different things in place to reserve data and metadata space,
>> because generally speaking data is much simpler. However the data reservations
>> still suffered from the same issues that plagued metadata reservations, you
>> could get multiple tasks racing in to get reservations. This causes problems
>> with cases like write/delete loops where we should be able to fill up the fs,
>> delete everything, and go again. You would sometimes race with a flusher that's
>> trying to unpin the free space, take it's reservations, and then it would fail.
>>
>> Fix this by moving the data reservations under the metadata ticketing
>> infrastructure. This gets rid of that problem, and simplifies our enospc code
>> more by consolidating it into a single path. Thanks,
>
> I created a for-next-20200703 snapshot with this branch included, and it
> went up to generic/102 and got stuck due to softlockups. This could mean
> the machine is overloaded but it usually recovers from that, while not
> in this case as it took more than 7 hours before I killed the VM.
>
> There is the dio-iomap so the patchsets could interact in some way, I'll
> do more tests next week, this is an early warning that something might
> be going on.
Softlockup in __slab_alloc, I think we were just the victim here. Thanks,
Josef
prev parent reply other threads:[~2020-07-07 15:28 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 13:58 [PATCH 00/23] Change data reservations to use the ticketing infra Josef Bacik
2020-06-30 13:58 ` [PATCH 01/23] btrfs: change nr to u64 in btrfs_start_delalloc_roots Josef Bacik
2020-06-30 13:59 ` [PATCH 02/23] btrfs: remove orig from shrink_delalloc Josef Bacik
2020-06-30 13:59 ` [PATCH 03/23] btrfs: handle U64_MAX for shrink_delalloc Josef Bacik
2020-06-30 13:59 ` [PATCH 04/23] btrfs: make shrink_delalloc take space_info as an arg Josef Bacik
2020-06-30 13:59 ` [PATCH 05/23] btrfs: make ALLOC_CHUNK use the space info flags Josef Bacik
2020-06-30 13:59 ` [PATCH 06/23] btrfs: call btrfs_try_granting_tickets when freeing reserved bytes Josef Bacik
2020-06-30 13:59 ` [PATCH 07/23] btrfs: call btrfs_try_granting_tickets when unpinning anything Josef Bacik
2020-06-30 13:59 ` [PATCH 08/23] btrfs: call btrfs_try_granting_tickets when reserving space Josef Bacik
2020-06-30 13:59 ` [PATCH 09/23] btrfs: use the btrfs_space_info_free_bytes_may_use helper for delalloc Josef Bacik
2020-06-30 13:59 ` [PATCH 10/23] btrfs: use btrfs_start_delalloc_roots in shrink_delalloc Josef Bacik
2020-06-30 13:59 ` [PATCH 11/23] btrfs: check tickets after waiting on ordered extents Josef Bacik
2020-06-30 13:59 ` [PATCH 12/23] btrfs: add flushing states for handling data reservations Josef Bacik
2020-06-30 13:59 ` [PATCH 13/23] btrfs: add the data transaction commit logic into may_commit_transaction Josef Bacik
2020-07-07 14:39 ` Nikolay Borisov
2020-07-07 14:54 ` Josef Bacik
2020-07-07 15:01 ` Josef Bacik
2020-06-30 13:59 ` [PATCH 14/23] btrfs: add btrfs_reserve_data_bytes and use it Josef Bacik
2020-06-30 13:59 ` [PATCH 15/23] btrfs: use ticketing for data space reservations Josef Bacik
2020-07-07 14:46 ` Nikolay Borisov
2020-07-07 14:56 ` Josef Bacik
2020-06-30 13:59 ` [PATCH 16/23] btrfs: serialize data reservations if we are flushing Josef Bacik
2020-06-30 13:59 ` [PATCH 17/23] btrfs: use the same helper for data and metadata reservations Josef Bacik
2020-06-30 13:59 ` [PATCH 18/23] btrfs: drop the commit_cycles stuff for data reservations Josef Bacik
2020-06-30 13:59 ` [PATCH 19/23] btrfs: don't force commit if we are data Josef Bacik
2020-06-30 13:59 ` [PATCH 20/23] btrfs: run delayed iputs before committing the transaction for data Josef Bacik
2020-06-30 13:59 ` [PATCH 21/23] btrfs: flush delayed refs when trying to reserve data space Josef Bacik
2020-06-30 13:59 ` [PATCH 22/23] btrfs: do async reclaim for data reservations Josef Bacik
2020-06-30 13:59 ` [PATCH 23/23] btrfs: add a comment explaining the data flush steps Josef Bacik
2020-07-03 16:30 ` [PATCH 00/23] Change data reservations to use the ticketing infra David Sterba
2020-07-07 15:28 ` Josef Bacik [this message]
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