linux-nfs.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Andrei Warkentin <awarkentin@vmware.com>
To: linux-nfs@vger.kernel.org
Subject: Race between NFS server thread increase / decrease
Date: Mon, 26 Nov 2012 13:49:57 -0800 (PST)	[thread overview]
Message-ID: <864189844.31754280.1353966597599.JavaMail.root@vmware.com> (raw)
In-Reply-To: <477254919.31693823.1353963259597.JavaMail.root@vmware.com>

Hi NFSD developers,

I've found what I think is an interesting problem that occurs on single-CPU machines as far as I can tell.

Basically the following snippet will occasionally loop forever printing that one thread is still running. Further
attempts to run "/usr/sbin/rpc.nfsd 0" don't help.

/usr/sbin/rpc.nfsd 1
/usr/sbin/rpc.nfsd 0
while [ ! $[`cat /proc/fs/nfsd/threads`] -eq 0 ]; do
        echo $[`cat /proc/fs/nfsd/threads`] still running
        sleep .1
done

I've not looked a whole lot at it. It appears that although the paths calling svc_set_num_threads synchronize on nfsd_mutex, the code doesn't seem to try waiting on the number of threads to reach the desired count.

What do you guys think?

Thanks.

A

       reply	other threads:[~2012-11-26 21:49 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <477254919.31693823.1353963259597.JavaMail.root@vmware.com>
2012-11-26 21:49 ` Andrei Warkentin [this message]
2012-11-28 14:57   ` Race between NFS server thread increase / decrease J. Bruce Fields

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=864189844.31754280.1353966597599.JavaMail.root@vmware.com \
    --to=awarkentin@vmware.com \
    --cc=linux-nfs@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).