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Date:      Mon, 13 Oct 2014 20:14:30 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        "K. Macy" <kmacy@freebsd.org>
Cc:        "freebsd-fs@FreeBSD.org" <freebsd-fs@freebsd.org>, FreeBSD Stable <freebsd-stable@freebsd.org>
Subject:   Re: zfs pool import hangs on [tx->tx_sync_done_cv]
Message-ID:  <15EB5C3A83504A949CBDA96420361ADB@multiplay.co.uk>
References:  <54372173.1010100@ijs.si> <644FA8299BF848E599B82D2C2C298EA7@multiplay.co.uk> <54372EBA.1000908@ijs.si> <DE7DD7A94E9B4F1FBB3AFF57EDB47C67@multiplay.co.uk> <543731F3.8090701@ijs.si> <543AE740.7000808@ijs.si> <A5BA41116A7F4B23A9C9E469C4146B99@multiplay.co.uk> <CAHM0Q_N%2BC=3qgUnyDkEugOFcL=J8gBjbTg8v45Vz3uT=e=Fn2g@mail.gmail.com> <6E01BBEDA9984CCDA14F290D26A8E14D@multiplay.co.uk> <CAHM0Q_Mej=GvXoVo9TM5CfSZ=ozZ5pZvyY6%2BY29-B3qR-1zrKw@mail.gmail.com>

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----- Original Message ----- 
From: "K. Macy" <kmacy@freebsd.org>
To: "Steven Hartland" <killing@multiplay.co.uk>
Cc: "Mark Martinec" <Mark.Martinec+freebsd@ijs.si>; "freebsd-fs@FreeBSD.org" <freebsd-fs@freebsd.org>; "FreeBSD Stable" 
<freebsd-stable@freebsd.org>
Sent: Monday, October 13, 2014 7:43 PM
Subject: Re: zfs pool import hangs on [tx->tx_sync_done_cv]


>>> A recent quick read of the code would lead me to believe that
>>
>> Yer I would have got the zio details but typically its "optimised out" by
>> the
>> compiler, so will need some effort to track that down unfortunately :(
>
> FYI it isn't actually optimized out. The debug info accounting just
> isn't very good about tracking the values in registers. You'll see in
> my last mail that just looking at the assembler makes it pretty
> obvious that zio was in %r14. HTH.
>
> Cheers.
>
>
> -K
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