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Andrei VaginandgVisor bot
bb7c86cc94
The vDSO calls are much faster. For exeample, here are results of read_benchmark_test_tmpfs_kvm before and after this change: Before: BM_Read/65536/real_time 7309 ns 7260 ns 82640 bytes_per_second=8.35016G/s After: BM_Read/65536/real_time 2065 ns 2080 ns 346151 bytes_per_second=29.558G/s PiperOrigin-RevId: 409547486
32 lines
910 B
ArmAsm
32 lines
910 B
ArmAsm
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "textflag.h"
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#define SYS_clock_gettime 113
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TEXT ·vdsoClockGettime(SB), NOSPLIT, $0-24
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MOVW clockid+0(FP), R0
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MOVD ts+8(FP), R1
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MOVD runtime·vdsoClockgettimeSym(SB), R2
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CBZ R2, fallback
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BL (R2)
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MOVD R0, ret+16(FP)
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RET
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fallback:
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MOVD $SYS_clock_gettime, R8
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SVC
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MOVD R0, ret+16(FP)
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RET
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