mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Andrei Vagin
0e55b57452
This is the most often pattern of calling system calls in real applications. PiperOrigin-RevId: 367320048
56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
// Copyright 2020 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 <sys/syscall.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "benchmark/benchmark.h"
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namespace gvisor {
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namespace testing {
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namespace {
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void BM_Getpid(benchmark::State& state) {
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for (auto _ : state) {
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syscall(SYS_getpid);
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}
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}
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BENCHMARK(BM_Getpid);
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#ifdef __x86_64__
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#define SYSNO_STR1(x) #x
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#define SYSNO_STR(x) SYSNO_STR1(x)
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// BM_GetpidOpt uses the most often pattern of calling system calls:
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// mov $SYS_XXX, %eax; syscall.
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void BM_GetpidOpt(benchmark::State& state) {
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for (auto s : state) {
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__asm__("movl $" SYSNO_STR(SYS_getpid) ", %%eax\n"
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"syscall\n"
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: : : "rax", "rcx", "r11");
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}
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}
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BENCHMARK(BM_GetpidOpt);
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#endif // __x86_64__
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} // namespace
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} // namespace testing
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} // namespace gvisor
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