* Lucas Meneghel Rodrigues <lmr@xxxxxxxxxx> [2009-07-28 22:40]:
> 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: Luká?? Doktor <ldoktor@xxxxxxxxxx>
> Signed-off-by: Lucas Meneghel Rodrigues <lmr@xxxxxxxxxx>
Looks good. one nit below.
Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx>
> ---
> client/tests/kvm/kvm_tests.cfg.sample | 8 +++
> client/tests/kvm/kvm_vm.py | 11 +++
> client/tests/kvm/scripts/hugepage.py | 109 +++++++++++++++++++++++++++++++++
> 3 files changed, 128 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..7cd12cb 100644
> --- a/client/tests/kvm/kvm_tests.cfg.sample
> +++ b/client/tests/kvm/kvm_tests.cfg.sample
> @@ -587,6 +587,13 @@ variants:
>
>
> variants:
> + - @kvm_smallpages:
> + - kvm_hugepages:
> + pre_command = "/usr/bin/python scripts/hugepage.py /mnt/kvm_hugepage"
> + extra_params += " -mem-path /mnt/kvm_hugepage"
> +
> +
> +variants:
> - @basic:
> only Fedora Windows
> - @full:
> @@ -598,6 +605,7 @@ 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..dc36da4
> --- /dev/null
> +++ b/client/tests/kvm/scripts/hugepage.py
> @@ -0,0 +1,109 @@
> +#!/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)
Nit: Maybe a comment about the fudge factor being added in?
> + 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()
> + 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.
> + """
> + if not os.path.ismount(self.hugepage_path):
> + 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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--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh@xxxxxxxxxx
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