16c00db4bb
Pull AFS fixes from David Howells:
"Here's a set of patches that fix a number of bugs in the in-kernel AFS
client, including:
- Fix directory locking to not use individual page locks for
directory reading/scanning but rather to use a semaphore on the
afs_vnode struct as the directory contents must be read in a single
blob and data from different reads must not be mixed as the entire
contents may be shuffled about between reads.
- Fix address list parsing to handle port specifiers correctly.
- Only give up callback records on a server if we actually talked to
that server (we might not be able to access a server).
- Fix some callback handling bugs, including refcounting,
whole-volume callbacks and when callbacks actually get broken in
response to a CB.CallBack op.
- Fix some server/address rotation bugs, including giving up if we
can't probe a server; giving up if a server says it doesn't have a
volume, but there are more servers to try.
- Fix the decoding of fetched statuses to be OpenAFS compatible.
- Fix the handling of server lookups in Cache Manager ops (such as
CB.InitCallBackState3) to use a UUID if possible and to handle no
server being found.
- Fix a bug in server lookup where not all addresses are compared.
- Fix the non-encryption of calls that prevents some servers from
being accessed (this also requires an AF_RXRPC patch that has
already gone in through the net tree).
There's also a patch that adds tracepoints to log Cache Manager ops
that don't find a matching server, either by UUID or by address"
* tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Fix the non-encryption of calls
afs: Fix CB.CallBack handling
afs: Fix whole-volume callback handling
afs: Fix afs_find_server search loop
afs: Fix the handling of an unfound server in CM operations
afs: Add a tracepoint to record callbacks from unlisted servers
afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID
afs: Fix VNOVOL handling in address rotation
afs: Fix AFSFetchStatus decoder to provide OpenAFS compatibility
afs: Fix server rotation's handling of fileserver probe failure
afs: Fix refcounting in callback registration
afs: Fix giving up callbacks on server destruction
afs: Fix address list parsing
afs: Fix directory page locking
69 lines
2.9 KiB
Python
Executable file
69 lines
2.9 KiB
Python
Executable file
#! /usr/bin/python
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# -*- python -*-
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# -*- coding: utf-8 -*-
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# twatch - Experimental use of the perf python interface
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# Copyright (C) 2011 Arnaldo Carvalho de Melo <acme@redhat.com>
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#
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# This application is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2.
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#
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# This application is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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import perf
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def main(context_switch = 0, thread = -1):
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cpus = perf.cpu_map()
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threads = perf.thread_map(thread)
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evsel = perf.evsel(type = perf.TYPE_SOFTWARE,
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config = perf.COUNT_SW_DUMMY,
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task = 1, comm = 1, mmap = 0, freq = 0,
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wakeup_events = 1, watermark = 1,
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sample_id_all = 1, context_switch = context_switch,
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sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU)
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"""What we want are just the PERF_RECORD_ lifetime events for threads,
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using the default, PERF_TYPE_HARDWARE + PERF_COUNT_HW_CYCLES & freq=1
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(the default), makes perf reenable irq_vectors:local_timer_entry, when
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disabling nohz, not good for some use cases where all we want is to get
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threads comes and goes... So use (perf.TYPE_SOFTWARE, perf_COUNT_SW_DUMMY,
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freq=0) instead."""
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evsel.open(cpus = cpus, threads = threads);
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evlist = perf.evlist(cpus, threads)
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evlist.add(evsel)
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evlist.mmap()
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while True:
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evlist.poll(timeout = -1)
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for cpu in cpus:
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event = evlist.read_on_cpu(cpu)
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if not event:
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continue
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print("cpu: {0}, pid: {1}, tid: {2} {3}".format(event.sample_cpu,
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event.sample_pid,
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event.sample_tid,
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event))
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if __name__ == '__main__':
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"""
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To test the PERF_RECORD_SWITCH record, pick a pid and replace
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in the following line.
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Example output:
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cpu: 3, pid: 31463, tid: 31593 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31593, switch_out: 1 }
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cpu: 1, pid: 31463, tid: 31489 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31489, switch_out: 1 }
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cpu: 2, pid: 31463, tid: 31496 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31496, switch_out: 1 }
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cpu: 3, pid: 31463, tid: 31491 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31491, switch_out: 0 }
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It is possible as well to use event.misc & perf.PERF_RECORD_MISC_SWITCH_OUT
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to figure out if this is a context switch in or out of the monitored threads.
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If bored, please add command line option parsing support for these options :-)
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"""
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# main(context_switch = 1, thread = 31463)
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main()
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