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Every vCPU now uses a separate set of TBs for each set of dynamic tracing event state values. Each set of TBs can be used by any number of vCPUs to maximize TB reuse when vCPUs have the same tracing state. This feature is later used by tracetool to optimize tracing of guest code events. The maximum number of TB sets is defined as 2^E, where E is the number of events that have the 'vcpu' property (their state is stored in CPUState->trace_dstate). For this to work, a change on the dynamic tracing state of a vCPU will force it to flush its virtual TB cache (which is only indexed by address), and fall back to the physical TB cache (which now contains the vCPU's dynamic tracing state as part of the hashing function). Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Reviewed-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Emilio G. Cota <cota@braap.org> Message-id: 149915775266.6295.10060144081246467690.stgit@frigg.lan Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
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* xxHash - Fast Hash algorithm
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* Copyright (C) 2012-2016, Yann Collet
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*
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* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* + Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* + Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You can contact the author at :
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* - xxHash source repository : https://github.com/Cyan4973/xxHash
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*/
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#ifndef EXEC_TB_HASH_XX_H
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#define EXEC_TB_HASH_XX_H
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#include "qemu/bitops.h"
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#define PRIME32_1 2654435761U
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#define PRIME32_2 2246822519U
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#define PRIME32_3 3266489917U
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#define PRIME32_4 668265263U
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#define PRIME32_5 374761393U
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#define TB_HASH_XX_SEED 1
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/*
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* xxhash32, customized for input variables that are not guaranteed to be
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* contiguous in memory.
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*/
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static inline
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uint32_t tb_hash_func6(uint64_t a0, uint64_t b0, uint32_t e, uint32_t f)
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{
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uint32_t v1 = TB_HASH_XX_SEED + PRIME32_1 + PRIME32_2;
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uint32_t v2 = TB_HASH_XX_SEED + PRIME32_2;
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uint32_t v3 = TB_HASH_XX_SEED + 0;
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uint32_t v4 = TB_HASH_XX_SEED - PRIME32_1;
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uint32_t a = a0 >> 32;
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uint32_t b = a0;
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uint32_t c = b0 >> 32;
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uint32_t d = b0;
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uint32_t h32;
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v1 += a * PRIME32_2;
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v1 = rol32(v1, 13);
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v1 *= PRIME32_1;
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v2 += b * PRIME32_2;
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v2 = rol32(v2, 13);
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v2 *= PRIME32_1;
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v3 += c * PRIME32_2;
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v3 = rol32(v3, 13);
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v3 *= PRIME32_1;
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v4 += d * PRIME32_2;
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v4 = rol32(v4, 13);
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v4 *= PRIME32_1;
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h32 = rol32(v1, 1) + rol32(v2, 7) + rol32(v3, 12) + rol32(v4, 18);
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h32 += 24;
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h32 += e * PRIME32_3;
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h32 = rol32(h32, 17) * PRIME32_4;
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h32 += f * PRIME32_3;
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h32 = rol32(h32, 17) * PRIME32_4;
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h32 ^= h32 >> 15;
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h32 *= PRIME32_2;
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h32 ^= h32 >> 13;
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h32 *= PRIME32_3;
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h32 ^= h32 >> 16;
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return h32;
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}
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#endif /* EXEC_TB_HASH_XX_H */
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