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Red Hat Bugzilla – Attachment 577980 Details for
Bug 694353
Multiple soft lockups in a short period of time
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io-idle-race script
io-idle-race.c (text/x-csrc), 653 bytes, created by
Suqin Huang
on 2012-04-17 10:26:44 UTC
(
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Description:
io-idle-race script
Filename:
MIME Type:
Creator:
Suqin Huang
Created:
2012-04-17 10:26:44 UTC
Size:
653 bytes
patch
obsolete
>#include <stdio.h> >#include <string.h> >#include <stdlib.h> >#include <unistd.h> >#include <asm/fcntl.h> >#include <time.h> >#include <assert.h> >#include <stdint.h> > >#define SIZE 4096 >#define S_AVG 10e9 >#define S_DELTA 2000 > >int main(int ac, char **av) >{ > int fd, r; > void *buf; > struct timespec ts; > double ns; > > fd = open("/bin/bash", O_RDONLY | O_DIRECT); > assert(fd != 0); > r = posix_memalign(&buf, SIZE, SIZE); > assert(r == 0); > while (1) { > r = pread(fd, buf, SIZE, 0); > assert(r == SIZE); > ns = S_AVG + S_DELTA * (drand48() * 2 - 1); > ts.tv_sec = ns / 1e9; > ts.tv_nsec = ns - ts.tv_sec * 1e9; > nanosleep(&ts, NULL); > } >}
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bug 694353
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