- 11 Dec, 2009 40 commits
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Nitin Gupta authored
Short guide on how to setup and use ramzswap. Signed-off-by:
Nitin Gupta <ngupta@vflare.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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Nitin Gupta authored
Creates RAM based block devices (/dev/ramzswapX) which can be used (only) as swap disks. Pages swapped to these are compressed and stored in memory itself. The module is called ramzswap.ko. It depends on: - xvmalloc memory allocator (compiled with this driver) - lzo_compress.ko - lzo_decompress.ko See ramzswap.txt for usage details. Signed-off-by:
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Nitin Gupta authored
* Features: - Low metadata overhead (just 4 bytes per object) - O(1) Alloc/Free - except when we have to call system page allocator to get additional memory. - Very low fragmentation: In all tests, xvmalloc memory usage is within 12% of "Ideal". - Pool based allocator: Each pool can grow and shrink. - It maps pages only when required. So, it does not hog vmalloc area which is very small on 32-bit systems. SLUB allocator could not be used due to fragmentation issues: http://code.google.com/p/compcache/wiki/AllocatorsComparison Data here shows kmalloc using ~43% more memory than TLSF and xvMalloc is showed ~2% more space efficiency than TLSF (due to smaller metadata). Creating various kmem_caches can reduce space efficiency gap but still problem of being limited to low memory exists. Also, it depends on allocating higher order pages to reduce fragmentation - this is not acceptable for ramzswap as it is used under memory crunch (its a swap device!). SLOB allocator could not be used do to reasons mentioned here: http://lkml.org/lkml/2009/3/18/210 * Implementation: It uses two-level bitmap search to find free list containing block of correct size. This idea is taken from TLSF (Two-Level Segregate Fit) allocator and is well explained in its paper (see [Links] below). * Limitations: - Poor scalability: No per-cpu data structures (work in progress). [Links] 1. Details and Performance data: http://code.google.com/p/compcache/wiki/xvMalloc http://code.google.com/p/compcache/wiki/xvMallocPerformance 2. TLSF memory allocator: home: http://rtportal.upv.es/rtmalloc/ paper: http://rtportal.upv.es/rtmalloc/files/MRBC_2008.pdfSigned-off-by:
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Ian Abbott authored
The COMEDI_CMDTEST ioctl needs to clear unsupported bits in the struct comedi_cmd's convert_src and other *_src members. This needs fixing in the pcl816 driver's AI cmdtest. Signed-off-by:
Ian Abbott <abbotti@mev.co.uk> Signed-off-by:
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Ian Abbott authored
The i8253_cascade_ns_to_timer_2div() function (and i8253_cascade_ns_to_timer macro) checks the old values *d1 and *d2 for correctness as a heuristic before calculating new values. Don't call the function with uninitialized values in *d1 and *d2. Signed-off-by:
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Ian Abbott authored
512 bytes of stack can be saved in serial_2002_open() by modifying 'struct config_t'. A short int suffices for the 'kind' and 'bits' members. (Actually, a char would suffice, but wouldn't save any more stack than a short int.) Signed-off-by:
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Bernd Porr authored
I've fixed a bug in the USBDUX driver which caused timeouts while sending commands to the boards. This was mainly because of one bulk transfer which had a timeout of 1ms (!). I've now set all timeouts to 1000ms. From: Bernd Porr <BerndPorr@f2s.com> Signed-off-by: -
Dirk Hohndel authored
80 char limit (where useful) braces around single line block KERN_ facility for printk Signed-off-by:
Dirk Hohndel <hohndel@infradead.org> Signed-off-by:
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Dirk Hohndel authored
add KERN_ facility to printk (mostly KERN_INFO, some KERN_WARNING) I think I found a bug - commented on it but didn't change as it's just in a printk (off by 1 error in output) Signed-off-by:
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Dirk Hohndel authored
No code changes - left some 80 char violations alone as folding those lines would have made code less readable Signed-off-by:
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Dirk Hohndel authored
don't initialize static variable to 0 Signed-off-by:
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Dirk Hohndel authored
add KERN_ facility to printk (mostly KERN_DEBUG, some KERN_WARNING) Signed-off-by:
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Dirk Hohndel authored
no code changes, just fixing white space, line length, etc Signed-off-by:
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Dirk Hohndel authored
Convert external function to static Signed-off-by:
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Dirk Hohndel authored
Style cleanup in staging based on Greg's tutorial / checkpatch Fix 80 char line length (where useful) - includes two changes to code to make it more logical / readable Remove {} around single line blocks Signed-off-by: -
Dirk Hohndel authored
Style cleanup in staging based on Greg's tutorial / checkpatch Add printk KERN_ facility level (KERN_WARNING seemed appropriate for all) Signed-off-by:
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Klaas van Gend authored
This patch fixes all warnings as issued by checkpatch.pl. Note that I had to modify some of the logging messages to make that possible. Signed-off-by:
Klaas van Gend <klaas.van.gend@mvista.com> Signed-off-by:
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Klaas van Gend authored
This patch fixes all warnings as issued by checkpatch.pl. Signed-off-by:
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Kevyn-Alexandre Paré authored
Signed-off-by:
Kevyn-Alexandre Paré <kevyn.alexandre.pare@gmail.com> Signed-off-by:
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Roel Kluin authored
The variables are unsigned so the test `>= 0' is always true, In these cases the other part of the test catch wrapped values. Signed-off-by:
Roel Kluin <roel.kluin@gmail.com> Signed-off-by:
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Klaas van Gend authored
Add KERN_ to printk statements to reduce the number of warnings shown by checkpatch.pl. Signed-off-by:
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Klaas van Gend authored
Remove braces in if statements to make the file exhibit less warnings when checked using checkpatch.pl. Signed-off-by:
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BRAGA, Bruno authored
Corrected coding style: - excessive curly braces - printk without KERN_* logging - 80+ chars per line of code Signed-off-by:
BRAGA, Bruno <bruno.braga@gmail.com> Signed-off-by:
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Shawn Bohrer authored
Signed-off-by:
Shawn Bohrer <shawn.bohrer@gmail.com> Signed-off-by:
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Shawn Bohrer authored
c++ isn't supported in the kernel. Signed-off-by:
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Shawn Bohrer authored
unlocked_ioctl() never returns -ENOIOCTLCMD so remove the check. Signed-off-by:
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Shawn Bohrer authored
All new kernels have support for compat_ioctl so remove the check and support for older kernels. Signed-off-by:
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Shawn Bohrer authored
All new kernels have unlocked_ioctl so we don't need to check. Signed-off-by:
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Daniel Patrick Johnson authored
Signed-off-by:
Daniel Patrick Johnson <teknotus@teknot.us> Signed-off-by:
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Daniel Patrick Johnson authored
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Daniel Patrick Johnson authored
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Daniel Patrick Johnson authored
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Dirk Hohndel authored
something-bility is spelled as something-blity so a grep for 'blit' would find these lines this is so trivial that I didn't split it by subsystem / copy additional maintainers - all changes are to comments The only purpose is to get fewer false positives when grepping around the kernel sources. Signed-off-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
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Kevyn-Alexandre Paré authored
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Kevyn-Alexandre Paré authored
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Bruce Jones authored
Correct coding style problems in this file. Signed-off-by:
Bruce Jones <brucej@linux.com> Signed-off-by:
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Bruce Jones authored
Fix up printk's and other simple coding style issues. Signed-off-by:
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Bruce Jones authored
Clean up the printk's in this driver. Signed-off-by:
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Shane Warden authored
Signed-off-by:
Shane Warden <shane.warden@onyxneon.com> Signed-off-by:
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Bruce Jones authored
Clean up formatting of a struct initializer, as per the standard conventions. Signed-off-by:
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