Messages in this thread | | | From | "Stephen C. Tweedie" <> | Date | Wed, 26 May 1999 17:34:38 +0100 (BST) | Subject | Re: kernel_lock() profiling results |
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Hi,
On Sun, 23 May 1999 16:30:52 +0200, Manfred Spraul <manfreds@colorfullife.com> said:
> Shouldn't we change file_read_actor() [mm/filemap.c, the function which > copies data from the page cache to user mode]: > we could release the kernel lock if we copy more than 1024 bytes. > (we currently do that only if the user mode memory is not paged in.)
ftp://ftp.uk.linux.org/pub/linux/sct/performance
contains a patch Dave Miller and I put together to drop the kernel lock during a number of key user mode copies.
--Stephen
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