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From: Stefan Roesch <[email protected]>
To: Jan Kara <[email protected]>, Christoph Hellwig <[email protected]>
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected],
	[email protected]
Subject: Re: [RFC PATCH v3 15/18] mm: Add balance_dirty_pages_ratelimited_async() function
Date: Fri, 20 May 2022 11:32:45 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>



On 5/19/22 1:54 AM, Jan Kara wrote:
> On Thu 19-05-22 01:29:21, Christoph Hellwig wrote:
>>> +static int balance_dirty_pages_ratelimited_flags(struct address_space *mapping,
>>> +						bool no_wait)
>>>  {
>>
>> This doesn't actully take flags, but a single boolean argument.  So
>> either it needs a new name, or we actually pass a descriptiv flag.
>>
>>> +/**
>>> + * balance_dirty_pages_ratelimited_async - balance dirty memory state
>>> + * @mapping: address_space which was dirtied
>>> + *
>>> + * Processes which are dirtying memory should call in here once for each page
>>> + * which was newly dirtied.  The function will periodically check the system's
>>> + * dirty state and will initiate writeback if needed.
>>> + *
>>> + * Once we're over the dirty memory limit we decrease the ratelimiting
>>> + * by a lot, to prevent individual processes from overshooting the limit
>>> + * by (ratelimit_pages) each.
>>> + *
>>> + * This is the async version of the API. It only checks if it is required to
>>> + * balance dirty pages. In case it needs to balance dirty pages, it returns
>>> + * -EAGAIN.
>>> + */
>>> +int  balance_dirty_pages_ratelimited_async(struct address_space *mapping)
>>> +{
>>> +	return balance_dirty_pages_ratelimited_flags(mapping, true);
>>> +}
>>> +EXPORT_SYMBOL(balance_dirty_pages_ratelimited_async);
>>
>> I'd much rather export the underlying
>> balance_dirty_pages_ratelimited_flags helper than adding a pointless
>> wrapper here.  And as long as only iomap is supported there is no need
>> to export it at all.
> 
> This was actually my suggestion so I take the blame ;) I have suggested
> this because I don't like non-static functions with bool arguments (it is
> unnecessarily complicated to understand what the argument means or grep for
> it etc.). If you don't like the wrapper, creating
> 
> int balance_dirty_pages_ratelimited_flags(struct address_space *mapping,
> 					  unsigned int flags)
> 
> and have something like:
> 
> #define BDP_NOWAIT 0x0001
> 

I defined a BDP_ASYNC flag.

> is fine with me as well.
> 
> 								Honza

  reply	other threads:[~2022-05-20 18:33 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-18 23:36 [RFC PATCH v3 00/18] io-uring/xfs: support async buffered writes Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 01/18] block: Add check for async buffered writes to generic_write_checks Stefan Roesch
2022-05-19  8:17   ` Christoph Hellwig
2022-05-20 18:23     ` Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 02/18] iomap: Add iomap_page_create_gfp to allocate iomap_pages Stefan Roesch
2022-05-19  8:18   ` Christoph Hellwig
2022-05-20 18:25     ` Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 03/18] iomap: Use iomap_page_create_gfp() in __iomap_write_begin Stefan Roesch
2022-05-19  8:19   ` Christoph Hellwig
2022-05-20 18:26     ` Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 04/18] iomap: Add async buffered write support Stefan Roesch
2022-05-19  8:25   ` Christoph Hellwig
2022-05-20 18:29     ` Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 05/18] xfs: Add iomap " Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 06/18] fs: Split off remove_needs_file_privs() __remove_file_privs() Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 07/18] fs: Split off file_needs_update_time and __file_update_time Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 08/18] xfs: Enable async write file modification handling Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 09/18] fs: Optimization for concurrent file time updates Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 10/18] xfs: Add async buffered write support Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 11/18] io_uring: Add support for async buffered writes Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 12/18] mm: Move starting of background writeback into the main balancing loop Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 13/18] mm: Move updates of dirty_exceeded into one place Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 14/18] mm: Prepare balance_dirty_pages() for async buffered writes Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 15/18] mm: Add balance_dirty_pages_ratelimited_async() function Stefan Roesch
2022-05-19  8:29   ` Christoph Hellwig
2022-05-19  8:54     ` Jan Kara
2022-05-20 18:32       ` Stefan Roesch [this message]
2022-05-20 18:29     ` Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 16/18] iomap: Use balance_dirty_pages_ratelimited_flags in iomap_write_iter Stefan Roesch
2022-05-19  8:32   ` Christoph Hellwig
2022-05-20 18:31     ` Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 17/18] io_uring: Add tracepoint for short writes Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 18/18] xfs: Enable async buffered write support Stefan Roesch
2022-05-19  8:32   ` Christoph Hellwig
2022-05-20 18:32     ` Stefan Roesch

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