Re: linux-next: Tree for September 4

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From: James Bottomley
Date: Saturday, September 6, 2008 - 6:42 am

On Sat, 2008-09-06 at 13:25 +0200, Rafael J. Wysocki wrote:

Um, I don't see how that follows.

get_request_wait() is the first thing the block layer does to try to get
a request structure for the queue.  If it's stuck there it means that
block was out of requests and is waiting for some memory to free up.  If
we're stuck there, nothing went down to the CD.

However, being stuck here really isn't good news.  These things are
mempool backed to prevent writeout deadlock ... we shouldn't be running
out of them.  What does 

/sys/block/<dev>/queue/nr_reqeusts

and

/sys/block/<dev>/stat

say for this device?

James


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Messages in current thread:
linux-next: Tree for September 4, Stephen Rothwell, (Thu Sep 4, 2:36 am)
Re: linux-next: Tree for September 4, Alan Cox, (Thu Sep 4, 4:52 am)
Re: linux-next: Tree for September 4, Stephen Rothwell, (Thu Sep 4, 5:51 am)
Re: linux-next: Tree for September 4, Andrew Morton, (Thu Sep 4, 4:53 pm)
Re: linux-next: Tree for September 4, David Woodhouse, (Thu Sep 4, 5:07 pm)
Re: linux-next: Tree for September 4 (PATCH: SND_USB), Randy Dunlap, (Thu Sep 4, 8:28 pm)
Re: linux-next: Tree for September 4 (PATCH: IXGBE), Randy Dunlap, (Thu Sep 4, 8:41 pm)
Re: linux-next: Tree for September 4, Andrew Morton, (Thu Sep 4, 9:44 pm)
Re: linux-next: Tree for September 4 (PATCH: SND_USB), Takashi Iwai, (Thu Sep 4, 11:10 pm)
Re: linux-next: Tree for September 4, Rafael J. Wysocki, (Fri Sep 5, 3:56 am)
Re: linux-next: Tree for September 4, Andrew Morton, (Fri Sep 5, 11:30 am)
Re: linux-next: Tree for September 4, Rafael J. Wysocki, (Sat Sep 6, 4:25 am)
Re: linux-next: Tree for September 4, James Bottomley, (Sat Sep 6, 6:42 am)