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| 1 #!/usr/bin/python | |
| 2 # -*- coding: utf-8 -*- | |
| 3 import os, sys, time | |
| 4 | |
| 5 """ | |
| 6 Simple script to allocate enough hugepages for KVM testing purposes. | |
| 7 """ | |
| 8 | |
| 9 class HugePageError(Exception): | |
| 10 """ | |
| 11 Simple wrapper for the builtin Exception class. | |
| 12 """ | |
| 13 pass | |
| 14 | |
| 15 | |
| 16 class HugePage: | |
| 17 def __init__(self, hugepage_path=None): | |
| 18 """ | |
| 19 Gets environment variable values and calculates the target number | |
| 20 of huge memory pages. | |
| 21 | |
| 22 @param hugepage_path: Path where to mount hugetlbfs path, if not | |
| 23 yet configured. | |
| 24 """ | |
| 25 self.vms = len(os.environ['KVM_TEST_vms'].split()) | |
| 26 self.mem = int(os.environ['KVM_TEST_mem']) | |
| 27 try: | |
| 28 self.max_vms = int(os.environ['KVM_TEST_max_vms']) | |
| 29 except KeyError: | |
| 30 self.max_vms = 0 | |
| 31 | |
| 32 if hugepage_path: | |
| 33 self.hugepage_path = hugepage_path | |
| 34 else: | |
| 35 self.hugepage_path = '/mnt/kvm_hugepage' | |
| 36 | |
| 37 self.hugepage_size = self.get_hugepage_size() | |
| 38 self.target_hugepages = self.get_target_hugepages() | |
| 39 print "Number of VMs this test will use: %d" % self.vms | |
| 40 print "Amount of memory used by each vm: %s" % self.mem | |
| 41 print ("System setting for large memory page size: %s" % | |
| 42 self.hugepage_size) | |
| 43 print ("Number of large memory pages needed for this test: %s" % | |
| 44 self.target_hugepages) | |
| 45 | |
| 46 | |
| 47 def get_hugepage_size(self): | |
| 48 """ | |
| 49 Get the current system setting for huge memory page size. | |
| 50 """ | |
| 51 meminfo = open('/proc/meminfo', 'r').readlines() | |
| 52 huge_line_list = [h for h in meminfo if h.startswith("Hugepagesize")] | |
| 53 try: | |
| 54 return int(huge_line_list[0].split()[1]) | |
| 55 except ValueError, e: | |
| 56 raise HugePageError("Could not get huge page size setting from " | |
| 57 "/proc/meminfo: %s" % e) | |
| 58 | |
| 59 | |
| 60 def get_target_hugepages(self): | |
| 61 """ | |
| 62 Calculate the target number of hugepages for testing purposes. | |
| 63 """ | |
| 64 if self.vms < self.max_vms: | |
| 65 self.vms = self.max_vms | |
| 66 # memory of all VMs plus qemu overhead of 64MB per guest | |
| 67 vmsm = (self.vms * self.mem) + (self.vms * 64) | |
| 68 return int(vmsm * 1024 / self.hugepage_size) | |
| 69 | |
| 70 | |
| 71 def set_hugepages(self): | |
| 72 """ | |
| 73 Sets the hugepage limit to the target hugepage value calculated. | |
| 74 """ | |
| 75 hugepage_cfg = open("/proc/sys/vm/nr_hugepages", "r+") | |
| 76 hp = hugepage_cfg.readline() | |
| 77 while int(hp) < self.target_hugepages: | |
| 78 loop_hp = hp | |
| 79 hugepage_cfg.write(str(self.target_hugepages)) | |
| 80 hugepage_cfg.flush() | |
| 81 hugepage_cfg.seek(0) | |
| 82 hp = int(hugepage_cfg.readline()) | |
| 83 if loop_hp == hp: | |
| 84 raise HugePageError("Cannot set the kernel hugepage setting " | |
| 85 "to the target value of %d hugepages." % | |
| 86 self.target_hugepages) | |
| 87 hugepage_cfg.close() | |
| 88 print ("Successfuly set %s large memory pages on host " % | |
| 89 self.target_hugepages) | |
| 90 | |
| 91 | |
| 92 def mount_hugepage_fs(self): | |
| 93 """ | |
| 94 Verify if there's a hugetlbfs mount set. If there's none, will set up | |
| 95 a hugetlbfs mount using the class attribute that defines the mount | |
| 96 point. | |
| 97 """ | |
| 98 if not os.path.ismount(self.hugepage_path): | |
| 99 if not os.path.isdir(self.hugepage_path): | |
| 100 os.makedirs(self.hugepage_path) | |
| 101 cmd = "mount -t hugetlbfs none %s" % self.hugepage_path | |
| 102 if os.system(cmd): | |
| 103 raise HugePageError("Cannot mount hugetlbfs path %s" % | |
| 104 self.hugepage_path) | |
| 105 | |
| 106 | |
| 107 def setup(self): | |
| 108 self.set_hugepages() | |
| 109 self.mount_hugepage_fs() | |
| 110 | |
| 111 | |
| 112 if __name__ == "__main__": | |
| 113 if len(sys.argv) < 2: | |
| 114 huge_page = HugePage() | |
| 115 else: | |
| 116 huge_page = HugePage(sys.argv[1]) | |
| 117 | |
| 118 huge_page.setup() | |
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Chromium Code Reviews
Issue 6246035:
Merge remote branch 'cros/upstream' into master (Closed)
Base URL: ssh://git@gitrw.chromium.org:9222/autotest.git@master