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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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13790d1cc7
This new test captures stackmap with build_id with hardware event PERF_COUNT_HW_CPU_CYCLES. Because we only support one ips-to-build_id lookup per cpu in NMI context, stack_amap will not be able to do the lookup in this test. Therefore, we didn't do compare_stack_ips(), as it will alwasy fail. urandom_read.c is extended to run configurable cycles so that it can be caught by the perf event. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
29 lines
419 B
C
29 lines
419 B
C
#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#define BUF_SIZE 256
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int main(int argc, char *argv[])
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{
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int fd = open("/dev/urandom", O_RDONLY);
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int i;
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char buf[BUF_SIZE];
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int count = 4;
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if (fd < 0)
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return 1;
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if (argc == 2)
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count = atoi(argv[1]);
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for (i = 0; i < count; ++i)
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read(fd, buf, BUF_SIZE);
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close(fd);
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return 0;
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}
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