From: Wang Jianchao <jianchao.wan9@gmail.com>
To: Theodore Ts'o <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
adilger.kernel@dilger.ca
Subject: Re: [PATCH V3 4/5] ext4: get discard out of jbd2 commit kthread contex
Date: Thu, 26 Aug 2021 16:58:26 +0800 [thread overview]
Message-ID: <5a3e272a-0714-4d10-d260-fc716f9438f9@gmail.com> (raw)
In-Reply-To: <65c6aa35-5e4c-a717-d1dc-8842e3ce0424@gmail.com>
On 2021/8/26 3:51 PM, Wang Jianchao wrote:
>>
>>> @@ -3672,8 +3724,14 @@ int __init ext4_init_mballoc(void)
>>> if (ext4_free_data_cachep == NULL)
>>> goto out_ac_free;
>>>
>>> + ext4_discard_wq = alloc_workqueue("ext4discard", WQ_UNBOUND, 0);
>>> + if (!ext4_discard_wq)
>>> + goto out_free_data;
>>> +
>>
>>
>> Perhaps we should only allocate the workqueue when it's needed ---
>> e.g., when a file system is mounted or remounted with "-o discard"?
>>
>> Then in ext4_exit_malloc(), we only free it if ext4_discard_wq is
>> non-NULL.
>>
>> This would save a bit of memory on systems that wouldn't need the ext4
>> discard work queue.
>
> Yes, it make sense to the system with pool memory
s/pool/poor :)
>
> Thanks so much
> Jianchao
>
>>
>> - Ted
>>
next prev parent reply other threads:[~2021-08-26 8:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-24 7:41 [PATCH V3 0/5] ext4: get discard out of jbd2 commit context Wang Jianchao
2021-07-24 7:41 ` [PATCH V3 1/5] ext4: remove the 'group' parameter of ext4_trim_extent Wang Jianchao
2021-07-26 3:42 ` Guoqing Jiang
2021-08-04 15:26 ` Jan Kara
2021-07-24 7:41 ` [PATCH V3 2/5] ext4: add new helper interface ext4_try_to_trim_range() Wang Jianchao
2021-08-04 15:29 ` Jan Kara
2021-08-12 17:44 ` Theodore Ts'o
2021-08-26 7:19 ` Wang Jianchao
2021-07-24 7:41 ` [PATCH V3 3/5] ext4: remove the repeated comment of ext4_trim_all_free Wang Jianchao
2021-08-04 15:27 ` Jan Kara
2021-07-24 7:41 ` [PATCH V3 4/5] ext4: get discard out of jbd2 commit kthread contex Wang Jianchao
2021-08-04 15:45 ` Jan Kara
2021-08-26 7:15 ` Wang Jianchao
2021-08-12 19:46 ` Theodore Ts'o
2021-08-26 7:51 ` Wang Jianchao
2021-08-26 8:58 ` Wang Jianchao [this message]
2021-07-24 7:41 ` [PATCH V3 5/5] ext4: make fallocate retry when err is ENOSPC Wang Jianchao
2021-07-26 3:40 ` Guoqing Jiang
2021-07-26 7:05 ` Wang Jianchao
2021-08-04 15:52 ` Jan Kara
2021-08-26 11:42 ` Wang Jianchao
2021-08-04 15:32 ` Jan Kara
2021-08-04 15:46 ` Jan Kara
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