* Luk?? Doktor <ldoktor@xxxxxxxxxx> [2009-07-28 08:22]:
> Yes, this looks more pythonish and actually better than my version. I'm
> missing only one thing, extra_params += " -mem-path /mnt/hugepage" down
> in configuration (see below).
Don't we also need to inspect the qemu binary to determine if it's one
of the few releases that used -mempath instead of -mem-path ? Or are we
ignoring those?
>
> This cause problem with predefined mount point, because it needs to be
> the same in extra_params and python script.
>
> Dne 27.7.2009 23:10, Lucas Meneghel Rodrigues napsal(a):
> >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: Luk???? 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"
>
> + extra_params += " -mem-path /mnt/hugepage"
>
> # ^^Tells qemu to allocate guest memory as hugepage
>
> I'd rather have this part of cfg look like this:
> variants:
> - @kvm_smallpages:
> - kvm_hugepages:
> pre_command = "/usr/bin/python scripts/hugepage.py
> /mnt/hugepage"
> extra_params += " -mem-path /mnt/hugepage"
>
> because this way it's more clear the relation between the constants. (it
> doesn't changes the script itself)
>
> >+
> >
> > 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()
> --
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--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh@xxxxxxxxxx
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