This patch adds a small setup script to set up huge memory
pages during the kvm tests execution. Also, added hugepage setup to the
fc8_quick sample.
Signed-off-by: Lukáš Doktor <ldoktor@xxxxxxxxxx>
Signed-off-by: Lucas Meneghel Rodrigues <lmr@xxxxxxxxxx>
---
client/tests/kvm/kvm_tests.cfg.sample | 6 ++
client/tests/kvm/kvm_vm.py | 11 +++
client/tests/kvm/scripts/hugepage.py | 110 +++++++++++++++++++++++++++++++++
3 files changed, 127 insertions(+), 0 deletions(-)
create mode 100644 client/tests/kvm/scripts/hugepage.py
diff --git a/client/tests/kvm/kvm_tests.cfg.sample b/client/tests/kvm/kvm_tests.cfg.sample
index 2d75a66..4a6a174 100644
--- a/client/tests/kvm/kvm_tests.cfg.sample
+++ b/client/tests/kvm/kvm_tests.cfg.sample
@@ -585,6 +585,11 @@ variants:
only default
image_format = raw
+variants:
+ - @kvm_smallpages:
+ - kvm_hugepages:
+ pre_command = "/usr/bin/python scripts/hugepage.py"
+
variants:
- @basic:
@@ -598,6 +603,7 @@ variants:
only Fedora.8.32
only install setup boot shutdown
only rtl8139
+ only kvm_hugepages
- @sample1:
only qcow2
only ide
diff --git a/client/tests/kvm/kvm_vm.py b/client/tests/kvm/kvm_vm.py
index d96b359..eba9b84 100644
--- a/client/tests/kvm/kvm_vm.py
+++ b/client/tests/kvm/kvm_vm.py
@@ -397,6 +397,17 @@ class VM:
self.destroy()
return False
+ # Get the output so far, to see if we have any problems with
+ # hugepage setup.
+ output = self.process.get_output()
+
+ if "alloc_mem_area" in output:
+ logging.error("Could not allocate hugepage memory; "
+ "qemu command:\n%s" % qemu_command)
+ logging.error("Output:" + kvm_utils.format_str_for_message(
+ self.process.get_output()))
+ return False
+
logging.debug("VM appears to be alive with PID %d",
self.process.get_pid())
return True
diff --git a/client/tests/kvm/scripts/hugepage.py b/client/tests/kvm/scripts/hugepage.py
new file mode 100644
index 0000000..9bc4194
--- /dev/null
+++ b/client/tests/kvm/scripts/hugepage.py
@@ -0,0 +1,110 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+import os, sys, time
+
+"""
+Simple script to allocate enough hugepages for KVM testing purposes.
+"""
+
+class HugePageError(Exception):
+ """
+ Simple wrapper for the builtin Exception class.
+ """
+ pass
+
+
+class HugePage:
+ def __init__(self, hugepage_path=None):
+ """
+ Gets environment variable values and calculates the target number
+ of huge memory pages.
+
+ @param hugepage_path: Path where to mount hugetlbfs path, if not
+ yet configured.
+ """
+ self.vms = len(os.environ['KVM_TEST_vms'].split())
+ self.mem = int(os.environ['KVM_TEST_mem'])
+ try:
+ self.max_vms = int(os.environ['KVM_TEST_max_vms'])
+ except KeyError:
+ self.max_vms = 0
+ if hugepage_path:
+ self.hugepage_path = hugepage_path
+ else:
+ self.hugepage_path = '/mnt/kvm_hugepage'
+ self.hugepage_size = self.get_hugepage_size()
+ self.target_hugepages = self.get_target_hugepages()
+
+
+ def get_hugepage_size(self):
+ """
+ Get the current system setting for huge memory page size.
+ """
+ meminfo = open('/proc/meminfo', 'r').readlines()
+ huge_line_list = [h for h in meminfo if h.startswith("Hugepagesize")]
+ try:
+ return int(huge_line_list[0].split()[1])
+ except ValueError, e:
+ raise HugePageError("Could not get huge page size setting from "
+ "/proc/meminfo: %s" % e)
+
+
+ def get_target_hugepages(self):
+ """
+ Calculate the target number of hugepages for testing purposes.
+ """
+ if self.vms < self.max_vms:
+ self.vms = self.max_vms
+ vmsm = (self.vms * self.mem) + (self.vms * 64)
+ return int(vmsm * 1024 / self.hugepage_size)
+
+
+ def set_hugepages(self):
+ """
+ Sets the hugepage limit to the target hugepage value calculated.
+ """
+ hugepage_cfg = open("/proc/sys/vm/nr_hugepages", "r+")
+ hp = hugepage_cfg.readline()
+ while int(hp) < self.target_hugepages:
+ loop_hp = hp
+ hugepage_cfg.write(str(self.target_hugepages))
+ hugepage_cfg.flush()
+ time.sleep(5)
+ hugepage_cfg.seek(0)
+ hp = int(hugepage_cfg.readline())
+ if loop_hp == hp:
+ raise HugePageError("Cannot set the kernel hugepage setting "
+ "to the target value of %d hugepages." %
+ self.target_hugepages)
+ hugepage_cfg.close()
+
+
+ def mount_hugepage_fs(self):
+ """
+ Verify if there's a hugetlbfs mount set. If there's none, will set up
+ a hugetlbfs mount using the class attribute that defines the mount
+ point.
+ """
+ current_mounts = open("/proc/mounts", "r").readlines()
+ huge_mounts = [m for m in current_mounts if m.split()[2] == "hugetlbfs"]
+ if len(huge_mounts) == 0:
+ if not os.path.isdir(self.hugepage_path):
+ os.makedirs(self.hugepage_path)
+ cmd = "mount -t hugetlbfs none %s" % self.hugepage_path
+ if os.system(cmd):
+ raise HugePageError("Cannot mount hugetlbfs path %s" %
+ self.hugepage_path)
+
+
+ def setup(self):
+ self.set_hugepages()
+ self.mount_hugepage_fs()
+
+
+if __name__ == "__main__":
+ if len(sys.argv) < 2:
+ huge_page = HugePage()
+ else:
+ huge_page = HugePage(sys.argv[1])
+
+ huge_page.setup()
--
1.6.2.5
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