#!/usr/bin/python # # show_deltas: Read list of printk messages instrumented with # time data, and format with time deltas. # # Also, you can show the times relative to a fixed point. # # Copyright 2003 Sony Corporation # # GPL 2.0 applies. import sys import string def usage(): print ("""usage: show_delta [] This program parses the output from a set of printk message lines which have time data prefixed because the CONFIG_PRINTK_TIME option is set, or the kernel command line option "time" is specified. When run with no options, the time information is converted to show the time delta between each printk line and the next. When run with the '-b' option, all times are relative to a single (base) point in time. Options: -h Show this usage help. -b Specify a base for time references. can be a number or a string. If it is a string, the first message line which matches (at the beginning of the line) is used as the time reference. ex: $ dmesg >timefile $ show_delta -b NET4 timefile will show times relative to the line in the kernel output starting with "NET4". """) sys.exit(1) # returns a tuple containing the seconds and text for each message line # seconds is returned as a float # raise an exception if no timing data was found def get_time(line): if line[0]!="[": raise ValueError # split on closing bracket (time_str, rest) = string.split(line[1:],']',1) time = string.atof(time_str) #print "time=", time return (time, rest) # average line looks like: # [ 0.084282] VFS: Mounted root (romfs filesystem) readonly # time data is expressed in seconds.useconds, # convert_line adds a delta for each line last_time = 0.0 def convert_line(line, base_time): global last_time try: (time, rest) = get_time(line) except: # if any problem parsing time, don't convert anything return line if base_time: # show time from base delta = time - base_time else: # just show time from last line delta = time - last_time last_time = time return ("[%5.6f < %5.6f >]" % (time, delta)) + rest def main(): base_str = "" filein = "" for arg in sys.argv[1:]: if arg=="-b": base_str = sys.argv[sys.argv.index("-b")+1] elif arg=="-h": usage() else: filein = arg if not filein: usage() try: lines = open(filein,"r").readlines() except: print ("Problem opening file: %s" % filein) sys.exit(1) if base_str: print ('base= "%s"' % base_str) # assume a numeric base. If that fails, try searching # for a matching line. try: base_time = float(base_str) except: # search for line matching string found = 0 for line in lines: try: (time, rest) = get_time(line) except: continue if string.find(rest, base_str)==1: base_time = time found = 1 # stop at first match break if not found: print ('Couldn\'t find line matching base pattern "%s"' % base_str) sys.exit(1) else: base_time = 0.0 for line in lines: print (convert_line(line, base_time),) main() et/rds/ib_sysctl.c

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author	Tejun Heo <tj@kernel.org>	2017-01-26 16:47:28 -0500
committer	Tejun Heo <tj@kernel.org>	2017-01-26 16:47:28 -0500
commit	07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree	75f65eba7eac9277971082a2d5a4cf1370562c0c /net/dcb/Kconfig
parent	7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)

cgroup: don't online subsystems before cgroup_name/path() are operational

While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+

Diffstat (limited to 'net/dcb/Kconfig')