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usr/bin/huge_page_setup_helper.py 0000666 00000030070 15047753005 0013214 0 ustar 00 #!/usr/bin/python
#
# Tool to set up Linux large page support with minimal effort
#
# by Jarod Wilson
# (c) Red Hat, Inc., 2009
#
# Requires hugeadm from libhugetlbfs 2.7 (or backported support)
#
import os
debug = False
# must be executed under the root to operate
if os.geteuid() != 0:
print "You must be root to setup hugepages!"
os._exit(1)
# config files we need access to
sysctlConf = "/etc/sysctl.conf"
if not os.access(sysctlConf, os.W_OK):
print "Cannot access %s" % sysctlConf
if debug == False:
os._exit(1)
# This file will be created if it doesn't exist
limitsConf = "/etc/security/limits.d/hugepages.conf"
# Figure out what we've got in the way of memory
memTotal = 0
hugePageSize = 0
hugePages = 0
hugeadmexplain = os.popen("/usr/bin/hugeadm --explain 2>/dev/null").readlines()
for line in hugeadmexplain:
if line.startswith("Total System Memory:"):
memTotal = int(line.split()[3])
break
if memTotal == 0:
print "Your version of libhugetlbfs' hugeadm utility is too old!"
os._exit(1)
# Pick the default huge page size and see how many pages are allocated
poolList = os.popen("/usr/bin/hugeadm --pool-list").readlines()
for line in poolList:
if line.split()[4] == '*':
hugePageSize = int(line.split()[0])
hugePages = int(line.split()[2])
break
if hugePageSize == 0:
print "Aborting, cannot determine system huge page size!"
os._exit(1)
# Get initial sysctl settings
shmmax = 0
hugeGID = 0
for line in hugeadmexplain:
if line.startswith("A /proc/sys/kernel/shmmax value of"):
shmmax = int(line.split()[4])
break
for line in hugeadmexplain:
if line.strip().startswith("vm.hugetlb_shm_group = "):
hugeGID = int(line.split()[2])
break
# translate group into textual version
hugeGIDName = "null"
groupNames = os.popen("/usr/bin/getent group").readlines()
for line in groupNames:
curGID = int(line.split(":")[2])
if curGID == hugeGID:
hugeGIDName = line.split(":")[0]
break
# dump system config as we see it before we start tweaking it
print "Current configuration:"
print " * Total System Memory......: %6d MB" % memTotal
print " * Shared Mem Max Mapping...: %6d MB" % (shmmax / (1024 * 1024))
print " * System Huge Page Size....: %6d MB" % (hugePageSize / (1024 * 1024))
print " * Number of Huge Pages.....: %6d" % hugePages
print " * Total size of Huge Pages.: %6d MB" % (hugePages * hugePageSize / (1024 * 1024))
print " * Remaining System Memory..: %6d MB" % (memTotal - (hugePages * hugePageSize / (1024 * 1024)))
print " * Huge Page User Group.....: %s (%d)" % (hugeGIDName, hugeGID)
print
# ask how memory they want to allocate for huge pages
userIn = None
while not userIn:
try:
userIn = raw_input("How much memory would you like to allocate for huge pages? "
"(input in MB, unless postfixed with GB): ")
if userIn[-2:] == "GB":
userHugePageReqMB = int(userIn[0:-2]) * 1024
elif userIn[-1:] == "G":
userHugePageReqMB = int(userIn[0:-1]) * 1024
elif userIn[-2:] == "MB":
userHugePageReqMB = int(userIn[0:-2])
elif userIn[-1:] == "M":
userHugePageReqMB = int(userIn[0:-1])
else:
userHugePageReqMB = int(userIn)
# As a sanity safeguard, require at least 128M not be allocated to huge pages
if userHugePageReqMB > (memTotal - 128):
userIn = None
print "Refusing to allocate %d, you must leave at least 128MB for the system" % userHugePageReqMB
elif userHugePageReqMB < (hugePageSize / (1024 * 1024)):
userIn = None
print "Sorry, allocation must be at least a page's worth!"
else:
break
except ValueError:
userIn = None
print "Input must be an integer, please try again!"
userHugePageReqKB = userHugePageReqMB * 1024
userHugePagesReq = userHugePageReqKB / (hugePageSize / 1024)
print "Okay, we'll try to allocate %d MB for huge pages..." % userHugePageReqMB
print
# some basic user input validation
badchars = list(' \\\'":;~`!$^&*(){}[]?/><,')
inputIsValid = False
# ask for the name of the group allowed access to huge pages
while inputIsValid == False:
foundbad = False
userGroupReq = raw_input("What group should have access to the huge pages?"
"(The group will be created, if need be) [hugepages]: ")
if userGroupReq is '':
userGroupReq = 'hugepages'
if userGroupReq[0].isdigit() or userGroupReq[0] == "-":
foundbad = True
print "Group names cannot start with a number or dash, please try again!"
for char in badchars:
if char in userGroupReq:
foundbad = True
print "Illegal characters in group name, please try again!"
break
if len(userGroupReq) > 16:
foundbad = True
print "Group names can't be more than 16 characaters, please try again!"
if foundbad == False:
inputIsValid = True
print "Okay, we'll give group %s access to the huge pages" % userGroupReq
# see if group already exists, use it if it does, if not, create it
userGIDReq = -1
for line in groupNames:
curGroupName = line.split(":")[0]
if curGroupName == userGroupReq:
userGIDReq = int(line.split(":")[2])
break
if userGIDReq > -1:
print "Group %s (gid %d) already exists, we'll use it" % (userGroupReq, userGIDReq)
else:
if debug == False:
os.popen("/usr/sbin/groupadd %s" % userGroupReq)
else:
print "/usr/sbin/groupadd %s" % userGroupReq
groupNames = os.popen("/usr/bin/getent group %s" % userGroupReq).readlines()
for line in groupNames:
curGroupName = line.split(":")[0]
if curGroupName == userGroupReq:
userGIDReq = int(line.split(":")[2])
break
print "Created group %s (gid %d) for huge page use" % (userGroupReq, userGIDReq)
print
# basic user input validation, take 2
# space is valid in this case, wasn't in the prior incarnation
badchars = list('\\\'":;~`!$^&*(){}[]?/><,')
inputIsValid = False
# ask for user(s) that should be in the huge page access group
while inputIsValid == False:
foundbad = False
userUsersReq = raw_input("What user(s) should have access to the huge pages (space-delimited list, users created as needed)? ")
for char in badchars:
if char in userUsersReq:
foundbad = True
print "Illegal characters in user name(s) or invalid list format, please try again!"
break
for n in userUsersReq.split():
if len(n) > 32:
foundbad = True
print "User names can't be more than 32 characaters, please try again!"
break
if n[0] == "-":
foundbad = True
print "User names cannot start with a dash, please try again!"
break
if foundbad == False:
inputIsValid = True
# see if user(s) already exist(s)
curUserList = os.popen("/usr/bin/getent passwd").readlines()
hugePageUserList = userUsersReq.split()
for hugeUser in hugePageUserList:
userExists = False
for line in curUserList:
curUser = line.split(":")[0]
if curUser == hugeUser:
print "Adding user %s to huge page group" % hugeUser
userExists = True
if debug == False:
os.popen("/usr/sbin/usermod -a -G %s %s" % (userGroupReq, hugeUser))
else:
print "/usr/sbin/usermod -a -G %s %s" % (userGroupReq, hugeUser)
if userExists == True:
break
if userExists == False:
print "Creating user %s with membership in huge page group" % hugeUser
if debug == False:
if hugeUser == userGroupReq:
os.popen("/usr/sbin/useradd %s -g %s" % (hugeUser, userGroupReq))
else:
os.popen("/usr/sbin/useradd %s -G %s" % (hugeUser, userGroupReq))
else:
print "/usr/sbin/useradd %s -G %s" % (hugeUser, userGroupReq)
print
# set values for the current running environment
if debug == False:
os.popen("/usr/bin/hugeadm --pool-pages-min DEFAULT:%sM" % userHugePageReqMB)
os.popen("/usr/bin/hugeadm --pool-pages-max DEFAULT:%sM" % userHugePageReqMB)
os.popen("/usr/bin/hugeadm --set-shm-group %d" % userGIDReq)
os.popen("/usr/bin/hugeadm --set-recommended-shmmax")
else:
print "/usr/bin/hugeadm --pool-pages-min DEFAULT:%sM" % userHugePageReqMB
print "/usr/bin/hugeadm --pool-pages-max DEFAULT:%sM" % userHugePageReqMB
print "/usr/bin/hugeadm --set-shm-group %d" % userGIDReq
print "/usr/bin/hugeadm --set-recommended-shmmax"
print
# figure out what that shmmax value we just set was
hugeadmexplain = os.popen("/usr/bin/hugeadm --explain 2>/dev/null").readlines()
for line in hugeadmexplain:
if line.strip().startswith("kernel.shmmax = "):
shmmax = int(line.split()[2])
break
# write out sysctl config changes to persist across reboot
if debug == False:
sysctlConfLines = "# sysctl configuration\n"
if os.access(sysctlConf, os.W_OK):
try:
sysctlConfLines = open(sysctlConf).readlines()
os.rename(sysctlConf, sysctlConf + ".backup")
print("Saved original %s as %s.backup" % (sysctlConf, sysctlConf))
except:
pass
fd = open(sysctlConf, "w")
for line in sysctlConfLines:
if line.startswith("kernel.shmmax"):
continue
elif line.startswith("vm.nr_hugepages"):
continue
elif line.startswith("vm.hugetlb_shm_group"):
continue
else:
fd.write(line);
fd.write("kernel.shmmax = %d\n" % shmmax)
fd.write("vm.nr_hugepages = %d\n" % userHugePagesReq)
fd.write("vm.hugetlb_shm_group = %d\n" % userGIDReq)
fd.close()
else:
print "Add to %s:" % sysctlConf
print "kernel.shmmax = %d" % shmmax
print "vm.nr_hugepages = %d" % userHugePagesReq
print "vm.hugetlb_shm_group = %d" % userGIDReq
print
# write out limits.conf changes to persist across reboot
if debug == False:
limitsConfLines = "# Huge page access configuration\n"
if os.access(limitsConf, os.W_OK):
try:
limitsConfLines = open(limitsConf).readlines()
os.rename(limitsConf, limitsConf + ".backup")
print("Saved original %s as %s.backup" % (limitsConf, limitsConf))
except:
pass
fd = open(limitsConf, "w")
for line in limitsConfLines:
cfgExist = False
for hugeUser in hugePageUserList:
try:
if line.split()[0] == hugeUser:
cfgExist = True
except IndexError:
# hit either white or comment line, it is safe not to take
# any action and continue.
pass
if cfgExist == True:
continue
else:
fd.write(line)
for hugeUser in hugePageUserList:
fd.write("%s soft memlock %d\n" % (hugeUser, userHugePageReqKB))
fd.write("%s hard memlock %d\n" % (hugeUser, userHugePageReqKB))
fd.close()
else:
print "Add to %s:" % limitsConf
for hugeUser in hugePageUserList:
print "%s soft memlock %d" % (hugeUser, userHugePageReqKB)
print "%s hard memlock %d" % (hugeUser, userHugePageReqKB)
# dump the final configuration of things now that we're done tweaking
print
print "Final configuration:"
print " * Total System Memory......: %6d MB" % memTotal
if debug == False:
print " * Shared Mem Max Mapping...: %6d MB" % (shmmax / (1024 * 1024))
else:
# This should be what we *would* have set it to, had we actually run hugeadm --set-recommended-shmmax
print " * Shared Mem Max Mapping...: %6d MB" % (userHugePagesReq * hugePageSize / (1024 * 1024))
print " * System Huge Page Size....: %6d MB" % (hugePageSize / (1024 * 1024))
print " * Available Huge Pages.....: %6d" % userHugePagesReq
print " * Total size of Huge Pages.: %6d MB" % (userHugePagesReq * hugePageSize / (1024 * 1024))
print " * Remaining System Memory..: %6d MB" % (memTotal - userHugePageReqMB)
print " * Huge Page User Group.....: %s (%d)" % (userGroupReq, userGIDReq)
print