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DateSun, 13 Oct 2002 00:50:05 -0700 (PDT)
SubjectRe: Strange load spikes on 2.4.19 kernel
From"David S. Miller" <>
   From: "Joseph D. Wagner" <wagnerjd@prodigy.net>
   Date: Sun, 13 Oct 2002 02:49:55 -0500

   > But there is no fundamental reason for that, we just haven't
   > gotten around to threading that bit yet.
   Oh yes there is.  What if an allocation of blocks and/or inodes is
   preempted?  Another thread could attempt to allocate the same set of
   blocks and/or inodes.

That's why we protect the allocation with SMP locking primitives
which under Linux prevent preemption.

This isn't rocket science, the IP networking is fully threaded for
example and I consider that about as hard to thread as something like
ext2/ext3 inode/block allocation.

Also, as Andi Kleen noted, it's actually filesystem dependant whether
the inode/block allocation is threaded or not.
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