linux-kernel - Re: [PATCH 2 of 4] Introduce i386 fibril scheduling

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Message-ID: <f2b55d220702070137k58d99449g604ebb352ad84c69@mail.gmail.com>
Date:	Wed, 7 Feb 2007 01:37:17 -0800
From:	"Michael K. Edwards" <medwards.linux@...il.com>
To:	"Davide Libenzi" <davidel@...ilserver.org>,
	"Kent Overstreet" <kent.overstreet@...il.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Zach Brown" <zach.brown@...cle.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-aio@...ck.org, "Suparna Bhattacharya" <suparna@...ibm.com>,
	"Benjamin LaHaise" <bcrl@...ck.org>
Subject: Re: [PATCH 2 of 4] Introduce i386 fibril scheduling

An idiot using my keyboard wrote:
>     - AIO requests that are serviced from cache ought to immediately
> invoke the callback, in the same thread context as the caller, fixing
> up the stack so that the callback returns to the instruction following
> the syscall.  That way the "immediate completion" path through the
> callback can manipulate data structures, allocate memory, etc. just as
> if it had followed a synchronous call.

Or, of course:
    if (async_stat(entry) == 0) {
        ... immediate completion code path ...
    }

Ugh.  But I think the discussion about the delayed path still holds.

- Michael
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