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Adjust vm.max_wired in order to avoid hitting EAGAIN artificially

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Set vm.max_wired to INT_MAX in :mlock_err, :mlock_mmap, and :mlock_nested to
avoid hitting EAGAIN artificially on the system when running the tests

Require root privileges in order to set the sysctl

Add allow_sysctl_side_effects to require.config as this test is now adjusting
sysctls that can affect the global system state

Unlike the version submitted by cem in OneFS, this version uses a scratch file
to save/restore the previous value of the sysctl. I _really_, _really_ wish
there were better hooks in atf/kyua for per test suite setup/teardown -- using
a file is kludgy, but it's the best I can do to avoid situations where (for
instance), sysctl(3) may fail and drop a core outside the kyua sandbox.

Based on a patch submitted by cem, but modified to take business logic out of
ATF_TP_ADD_TCS(3).

Differential Revision: https://reviews.freebsd.org/D4779
MFC after: 1 month
Sponsored by: EMC / Isilon Storage Division
This commit is contained in:
Enji Cooper 2016-01-27 06:24:19 +00:00
parent b888adc784
commit 8e62f8414e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=294894
1 changed files with 137 additions and 0 deletions
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137
contrib/netbsd-tests/lib/libc/sys/t_mlock.c
View file

@ -47,12 +47,89 @@ __RCSID("$NetBSD: t_mlock.c,v 1.5 2014/02/26 20:49:26 martin Exp $");
#include <unistd.h>
#ifdef __FreeBSD__
#include <limits.h>
#define _KMEMUSER
#include <machine/vmparam.h>
#endif
static long page = 0;
#ifdef __FreeBSD__
#define VM_MAX_WIRED "vm.max_wired"
static void
vm_max_wired_sysctl(int *old_value, int *new_value)
{
size_t old_len;
size_t new_len = (new_value == NULL ? 0 : sizeof(int));
if (old_value == NULL)
printf("Setting the new value to %d\n", *new_value);
else {
ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, NULL, &old_len,
new_value, new_len) == 0,
"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));
}
ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, old_value, &old_len,
new_value, new_len) == 0,
"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));
if (old_value != NULL)
printf("Saved the old value (%d)\n", *old_value);
}
static void
set_vm_max_wired(int new_value)
{
FILE *fp;
int old_value;
fp = fopen(VM_MAX_WIRED, "w");
if (fp == NULL) {
atf_tc_skip("could not open %s for writing: %s",
VM_MAX_WIRED, strerror(errno));
return;
}
vm_max_wired_sysctl(&old_value, NULL);
ATF_REQUIRE_MSG(fprintf(fp, "%d", old_value) > 0,
"saving %s failed", VM_MAX_WIRED);
fclose(fp);
vm_max_wired_sysctl(NULL, &new_value);
}
static void
restore_vm_max_wired(void)
{
FILE *fp;
int saved_max_wired;
fp = fopen(VM_MAX_WIRED, "r");
if (fp == NULL) {
perror("fopen failed\n");
return;
}
if (fscanf(fp, "%d", &saved_max_wired) != 1) {
perror("fscanf failed\n");
fclose(fp);
return;
}
fclose(fp);
printf("old value in %s: %d\n", VM_MAX_WIRED, saved_max_wired);
if (saved_max_wired == 0) /* This will cripple the test host */
return;
vm_max_wired_sysctl(NULL, &saved_max_wired);
}
#endif
ATF_TC(mlock_clip);
ATF_TC_HEAD(mlock_clip, tc)
{
@ -78,11 +155,19 @@ ATF_TC_BODY(mlock_clip, tc)
free(buf);
}
#ifdef __FreeBSD__
ATF_TC_WITH_CLEANUP(mlock_err);
#else
ATF_TC(mlock_err);
#endif
ATF_TC_HEAD(mlock_err, tc)
{
atf_tc_set_md_var(tc, "descr",
"Test error conditions in mlock(2) and munlock(2)");
#ifdef __FreeBSD__
atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
atf_tc_set_md_var(tc, "require.user", "root");
#endif
}
ATF_TC_BODY(mlock_err, tc)
@ -99,6 +184,8 @@ ATF_TC_BODY(mlock_err, tc)
if ((uintptr_t)VM_MIN_ADDRESS > 0)
null_errno = EINVAL; /* NULL is not inside user VM */
#endif
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#else
if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0)
atf_tc_fail("failed to read vm.minaddress");
@ -139,6 +226,14 @@ ATF_TC_BODY(mlock_err, tc)
ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1);
}
#ifdef __FreeBSD__
ATF_TC_CLEANUP(mlock_err, tc)
{
restore_vm_max_wired();
}
#endif
ATF_TC(mlock_limits);
ATF_TC_HEAD(mlock_limits, tc)
{
@ -200,10 +295,18 @@ ATF_TC_BODY(mlock_limits, tc)
free(buf);
}
#ifdef __FreeBSD__
ATF_TC_WITH_CLEANUP(mlock_mmap);
#else
ATF_TC(mlock_mmap);
#endif
ATF_TC_HEAD(mlock_mmap, tc)
{
atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction");
#ifdef __FreeBSD__
atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
atf_tc_set_md_var(tc, "require.user", "root");
#endif
}
ATF_TC_BODY(mlock_mmap, tc)
@ -215,6 +318,11 @@ ATF_TC_BODY(mlock_mmap, tc)
#endif
void *buf;
#ifdef __FreeBSD__
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#endif
/*
* Make a wired RW mapping and check that mlock(2)
* does not fail for the (already locked) mapping.
@ -248,11 +356,27 @@ ATF_TC_BODY(mlock_mmap, tc)
ATF_REQUIRE(munmap(buf, page) == 0);
}
#ifdef __FreeBSD__
ATF_TC_CLEANUP(mlock_mmap, tc)
{
restore_vm_max_wired();
}
#endif
#ifdef __FreeBSD__
ATF_TC_WITH_CLEANUP(mlock_nested);
#else
ATF_TC(mlock_nested);
#endif
ATF_TC_HEAD(mlock_nested, tc)
{
atf_tc_set_md_var(tc, "descr",
"Test that consecutive mlock(2) calls succeed");
#ifdef __FreeBSD__
atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
atf_tc_set_md_var(tc, "require.user", "root");
#endif
}
ATF_TC_BODY(mlock_nested, tc)
@ -260,6 +384,11 @@ ATF_TC_BODY(mlock_nested, tc)
const size_t maxiter = 100;
void *buf;
#ifdef __FreeBSD__
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#endif
buf = malloc(page);
ATF_REQUIRE(buf != NULL);
@ -270,6 +399,14 @@ ATF_TC_BODY(mlock_nested, tc)
free(buf);
}
#ifdef __FreeBSD__
ATF_TC_CLEANUP(mlock_nested, tc)
{
restore_vm_max_wired();
}
#endif
ATF_TP_ADD_TCS(tp)
{