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Instead of always creating a huge (268K) deflate_workspace with the
maximum compression parameters (windowBits=15, memLevel=8), allow the
caller to obtain a smaller workspace by specifying smaller parameter
values.
For example, when capturing oops and panic reports to a medium with
limited capacity, such as NVRAM, compression may be the only way to
capture the whole report. In this case, a small workspace (24K works
fine) is a win, whether you allocate the workspace when you need it (i.e.,
during an oops or panic) or at boot time.
I've verified that this patch works with all accepted values of windowBits
(positive and negative), memLevel, and compression level.
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Miller <davem@davemloft.net>
Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Upgrade the zlib_inflate implementation in the kernel from a patched
version 1.1.3/4 to a patched 1.2.3.
The code in the kernel is about seven years old and I noticed that the
external zlib library's inflate performance was significantly faster (~50%)
than the code in the kernel on ARM (and faster again on x86_32).
For comparison the newer deflate code is 20% slower on ARM and 50% slower
on x86_32 but gives an approx 1% compression ratio improvement. I don't
consider this to be an improvement for kernel use so have no plans to
change the zlib_deflate code.
Various changes have been made to the zlib code in the kernel, the most
significant being the extra functions/flush option used by ppp_deflate.
This update reimplements the features PPP needs to ensure it continues to
work.
This code has been tested on ARM under both JFFS2 (with zlib compression
enabled) and ppp_deflate and on x86_32. JFFS2 sees an approx. 10% real
world file read speed improvement.
This patch also removes ZLIB_VERSION as it no longer has a correct value.
We don't need version checks anyway as the kernel's module handling will
take care of that for us. This removal is also more in keeping with the
zlib author's wishes (http://www.zlib.net/zlib_faq.html#faq24) and I've
added something to the zlib.h header to note its a modified version.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Joern Engel <joern@wh.fh-wedel.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This patch contains the following possible cleanups:
- #if 0 the following unused functions:
- zlib_deflate/deflate.c: zlib_deflateSetDictionary
- zlib_deflate/deflate.c: zlib_deflateParams
- zlib_deflate/deflate.c: zlib_deflateCopy
- zlib_inflate/infblock.c: zlib_inflate_set_dictionary
- zlib_inflate/infblock.c: zlib_inflate_blocks_sync_point
- zlib_inflate/inflate_sync.c: zlib_inflateSync
- zlib_inflate/inflate_sync.c: zlib_inflateSyncPoint
- remove the following unneeded EXPORT_SYMBOL's:
- zlib_deflate/deflate_syms.c: zlib_deflateCopy
- zlib_deflate/deflate_syms.c: zlib_deflateParams
- zlib_inflate/inflate_syms.c: zlib_inflateSync
- zlib_inflate/inflate_syms.c: zlib_inflateSyncPoint
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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It's not the real deflateBound() in newer zlib libraries, partly because
the upcoming usage of it won't have the "stream" available, so we can't
have the same interfaces anyway.
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s/Z_NULL/NULL/g.
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We don't use any cplusplus in the kernel.
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Remove the stale support for K&R function declarations through the OF()
macro.
This is the last patch to clean up zconf.h, at least for now.
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Just a simple s/ZEXPORT//.
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This one was just simple s/ZEXTERN/extern/g.
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This removes FAR, the typedefs using FAR (Bytef and friends) and the
function prototypes for zalloc and zfree that should have gone earlier
already.
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This switches linux/zlib.h to include zconf.h as <linux/zconf.h> instead of
just "zconf.h".
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- Doug Ledford: i810 audio driver update
- Evgeniy Polyakov: update various SCSI drivers to new locking
- David Howells: syscall latency improvement, try 2
- Francois Romieu: dscc4 driver update
- Patrick Mochel: driver model fixes
- Andrew Morton: clean up a few details in ext3 inode initialization
- Pete Wyckoff: make x86 machine check print out right address..
- Hans Reiser: reiserfs update
- Richard Gooch: devfs update
- Greg KH: USB updates
- Dave Jones: PNPBIOS
- Nathan Scott: extended attributes
- Corey Minyard: clean up zlib duplication (triplication..)
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