user/sven/linux.git/lib/raid6/test, branch v4.9.191

lib/raid6: Fix arm64 test build

2018-11-27T15:09:39Z

[ Upstream commit 313a06e636808387822af24c507cba92703568b1 ] The lib/raid6/test fails to build the neon objects on arm64 because the correct machine type is 'aarch64'. Once this is correctly enabled, the neon recovery objects need to be added to the build. Reviewed-by: Ard Biesheuvel Signed-off-by: Jeremy Linton Signed-off-by: Catalin Marinas Signed-off-by: Sasha Levin

raid6/test/test.c: bug fix: Specify aligned(alignment) attributes to the char arrays

2016-09-26T23:18:21Z

Specifying the aligned attributes to the char data[NDISKS][PAGE_SIZE], char recovi[PAGE_SIZE] and char recovi[PAGE_SIZE] arrays, so that all malloc memory is page boundary aligned. Without these alignment attributes, the test causes a segfault in userspace when the NDISKS are changed to 4 from 16. The RAID stripes will be page aligned anyway, so we want to test what the kernel actually will execute. Cc: H. Peter Anvin Cc: Yu-cheng Yu Signed-off-by: Gayatri Kammela Reviewed-by: H. Peter Anvin Signed-off-by: Shaohua Li

lib/raid6/test/Makefile: Add avx512 gen_syndrome and recovery functions

2016-09-21T16:09:44Z

Adding avx512 gen_syndrome and recovery functions so as to allow code to be compiled and tested successfully in userspace. This patch is tested in userspace and improvement in performace is observed. Cc: H. Peter Anvin Cc: Jim Kukunas Cc: Fenghua Yu Signed-off-by: Megha Dey Signed-off-by: Gayatri Kammela Reviewed-by: Fenghua Yu Signed-off-by: Shaohua Li

md/raid6 algorithms: improve test program

2015-04-21T22:00:42Z

It is always helpful to have a test tool in place if we implement new data critical algorithms. So add some test routines to the raid6 checker that can prove if the new xor_syndrome() works as expected. Run through all permutations of start/stop pages per algorithm and simulate a xor_syndrome() assisted rmw run. After each rmw check if the recovery algorithm still confirms that the stripe is fine. Signed-off-by: Markus Stockhausen Signed-off-by: NeilBrown

Merge tag 'md/3.12' of git://neil.brown.name/md

2013-09-10T20:03:41Z

Pull md update from Neil Brown: "Headline item is multithreading for RAID5 so that more IO/sec can be supported on fast (SSD) devices. Also TILE-Gx SIMD suppor for RAID6 calculations and an assortment of bug fixes" * tag 'md/3.12' of git://neil.brown.name/md: raid5: only wakeup necessary threads md/raid5: flush out all pending requests before proceeding with reshape. md/raid5: use seqcount to protect access to shape in make_request. raid5: sysfs entry to control worker thread number raid5: offload stripe handle to workqueue raid5: fix stripe release order raid5: make release_stripe lockless md: avoid deadlock when dirty buffers during md_stop. md: Don't test all of mddev->flags at once. md: Fix apparent cut-and-paste error in super_90_validate raid6/test: replace echo -e with printf RAID: add tilegx SIMD implementation of raid6 md: fix safe_mode buglet. md: don't call md_allow_write in get_bitmap_file.

raid6/test: replace echo -e with printf

2013-08-27T06:06:06Z

-e is a non-standard echo option, echo output is implementation-dependent when it is used. Replace echo -e with printf as suggested by POSIX echo manual. Cc: NeilBrown Cc: Jim Kukunas Cc: "H. Peter Anvin" Cc: Yuanhan Liu Acked-by: H. Peter Anvin Signed-off-by: Max Filippov Signed-off-by: NeilBrown

RAID: add tilegx SIMD implementation of raid6

2013-08-27T06:05:50Z

This change adds TILE-Gx SIMD instructions to the software raid (md), modeling the Altivec implementation. This is only for Syndrome generation; there is more that could be done to improve recovery, as in the recent Intel SSE3 recovery implementation. The code unrolls 8 times; this turns out to be the best on tilegx hardware among the set 1, 2, 4, 8 or 16. The code reads one cache-line of data from each disk, stores P and Q then goes to the next cache-line. The test code in sys/linux/lib/raid6/test reports 2008 MB/s data read rate for syndrome generation using 18 disks (16 data and 2 parity). It was 1512 MB/s before this SIMD optimizations. This is running on 1 core with all the data in cache. This is based on the paper The Mathematics of RAID-6. (http://kernel.org/pub/linux/kernel/people/hpa/raid6.pdf). Signed-off-by: Ken Steele Signed-off-by: Chris Metcalf Signed-off-by: NeilBrown

lib/raid6: add ARM-NEON accelerated syndrome calculation

2013-07-08T21:09:18Z

Rebased/reworked a patch contributed by Rob Herring that uses NEON intrinsics to perform the RAID-6 syndrome calculations. It uses the existing unroll.awk code to generate several unrolled versions of which the best performing one is selected at boot time. Signed-off-by: Ard Biesheuvel Acked-by: Nicolas Pitre Cc: hpa@linux.intel.com

lib/raid6: build proper files on corresponding arch

2012-12-13T08:51:04Z

sse and avx2 stuff only exist on x86 arch, and we don't need to build altivec on x86. And we can do that at lib/raid6/Makefile. Proposed-by: H. Peter Anvin Signed-off-by: Yuanhan Liu Reviewed-by: H. Peter Anvin Signed-off-by: Jim Kukunas Signed-off-by: NeilBrown

lib/raid6: Add AVX2 optimized gen_syndrome functions

2012-12-13T08:51:03Z

Add AVX2 optimized gen_syndrom functions, which is simply based on sse2.c written by hpa. Signed-off-by: Yuanhan Liu Reviewed-by: H. Peter Anvin Signed-off-by: Jim Kukunas Signed-off-by: NeilBrown