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bug#9500: [PATCH]: use posix_fallocate where supported
From: |
Jim Meyering |
Subject: |
bug#9500: [PATCH]: use posix_fallocate where supported |
Date: |
Tue, 29 Nov 2011 14:22:33 +0100 |
Pádraig Brady wrote:
> On 11/25/2011 10:59 AM, Pádraig Brady wrote:
>> On 11/25/2011 10:13 AM, Pádraig Brady wrote:
>>
>>> Hmm, one of your points above got me thinking.
>>> Might fallocate() fail to allocate an extent with ENOSPC,
>>> but there could be fragmented space available to write()?
>>> That would scupper benefit (2) above :(
>>> I'll ask address@hidden
>>
>> And the response from there is that fallocate() will
>> check the free blocks first, and then try to allocate
>> as a contiguous extent, but that part is not guaranteed.
>> So we still get benefit (2).
>
> However that thread has continued, and it
> was mentioned that benefit (1) might actually
> be detrimental, at least for small files.
>
> http://thread.gmane.org/gmane.linux.file-systems/59092
Sigh, indeed.
Do you think it's even worth an option, now?
- bug#9500: [PATCH]: use posix_fallocate where supported, Pádraig Brady, 2011/11/22
- bug#9500: [PATCH]: use posix_fallocate where supported, Jim Meyering, 2011/11/23
- bug#9500: [PATCH]: use posix_fallocate where supported, Pádraig Brady, 2011/11/25
- bug#9500: [PATCH]: use posix_fallocate where supported, Pádraig Brady, 2011/11/25
- bug#9500: [PATCH]: use posix_fallocate where supported, Pádraig Brady, 2011/11/25
- bug#9500: [PATCH]: use posix_fallocate where supported, Goswin von Brederlow, 2011/11/26
- bug#9500: [PATCH]: use posix_fallocate where supported, Pádraig Brady, 2011/11/29
- bug#9500: [PATCH]: use posix_fallocate where supported,
Jim Meyering <=
- bug#9500: [PATCH]: use posix_fallocate where supported, Pádraig Brady, 2011/11/29
- bug#9500: [PATCH]: use posix_fallocate where supported, Paul Eggert, 2011/11/29
- bug#9500: [PATCH]: use posix_fallocate where supported, Goswin von Brederlow, 2011/11/30
- bug#9500: [PATCH]: use posix_fallocate where supported, Goswin von Brederlow, 2011/11/26