Messages in this thread | | | Date | Tue, 17 Nov 2009 07:47:39 -0500 | From | Jeff Layton <> | Subject | Re: [PATCH 6/7] cifs: Don't use PF_MEMALLOC |
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On Tue, 17 Nov 2009 16:22:32 +0900 (JST) KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> > Non MM subsystem must not use PF_MEMALLOC. Memory reclaim need few > memory, anyone must not prevent it. Otherwise the system cause > mysterious hang-up and/or OOM Killer invokation. > > Cc: Steve French <sfrench@samba.org> > Cc: linux-cifs-client@lists.samba.org > Cc: samba-technical@lists.samba.org > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > --- > fs/cifs/connect.c | 1 - > 1 files changed, 0 insertions(+), 1 deletions(-) > > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c > index 63ea83f..f9b1553 100644 > --- a/fs/cifs/connect.c > +++ b/fs/cifs/connect.c > @@ -337,7 +337,6 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server) > bool isMultiRsp; > int reconnect; > > - current->flags |= PF_MEMALLOC; > cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current))); > > length = atomic_inc_return(&tcpSesAllocCount);
This patch appears to be safe for CIFS. I believe that the demultiplex thread only does mempool allocations currently. The only other case where it did an allocation was recently changed with the conversion of the oplock break code to use slow_work.
Barring anything I've missed...
Acked-by: Jeff Layton <jlayton@redhat.com>
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