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selftests/powerpc: Bump up rlimit for perf-hwbreak test

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The systemwide perf hardware breakpoint test tries to open a perf event
on each cpu. On large systems, we run out of file descriptors and fail
the test. Instead, have the test set the file descriptor limit to an
arbitraty high value.

Reported-by: Rohan Deshpande <rohan_d@linux.vnet.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/187fed5843cecc1e5066677b6296ee88337d7bef.1669096083.git.naveen.n.rao@linux.vnet.ibm.com
This commit is contained in:
Naveen N. Rao 2022-11-22 12:10:53 +05:30 committed by Michael Ellerman
parent 71ae6305ad
commit 616ad3f4aa
1 changed files with 12 additions and 0 deletions
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12
tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
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@ -26,6 +26,7 @@
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/sysinfo.h>
#include <asm/ptrace.h>
#include <elf.h>
@ -140,8 +141,19 @@ static void disable_fds(int *fd, int n)
static int perf_systemwide_event_open(int *fd, __u32 type, __u64 addr, __u64 len)
{
struct rlimit rlim;
int i = 0;
if (getrlimit(RLIMIT_NOFILE, &rlim)) {
perror("getrlimit");
return -1;
}
rlim.rlim_cur = 65536;
if (setrlimit(RLIMIT_NOFILE, &rlim)) {
perror("setrlimit");
return -1;
}
/* Assume online processors are 0 to nprocs for simplisity */
for (i = 0; i < nprocs; i++) {
fd[i] = perf_cpu_event_open(i, type, addr, len);