Re: Online checksums verification in the backend

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От Andres Freund
Тема Re: Online checksums verification in the backend
Дата
Msg-id 20201030050852.5eenoh3sk2uxnv53@alap3.anarazel.de
обсуждение исходный текст
Ответ на Re: Online checksums verification in the backend  (Julien Rouhaud <rjuju123@gmail.com>)
Ответы Re: Online checksums verification in the backend  (Michael Paquier <michael@paquier.xyz>)
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On 2020-10-30 11:58:13 +0800, Julien Rouhaud wrote:
> So I'm assuming that the previous optimization to avoid almost every
> time doing an IO while holding a buffer mapping lock isn't an option?
> In that case, I don't see any other option than reverting the patch
> and discussing a new approach.

I think its pretty much *never* OK to do IO while holding a buffer
mapping lock. You're locking a significant fraction of shared buffers
over IO. That's just not OK.  Don't think there's any place doing so
currently either.

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