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
48 lines
1.5 KiB
Python
Executable file
48 lines
1.5 KiB
Python
Executable file
#! /usr/bin/python
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# SPDX-License-Identifier: GPL-2.0
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# -*- python -*-
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# -*- coding: utf-8 -*-
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import perf
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class tracepoint(perf.evsel):
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def __init__(self, sys, name):
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config = perf.tracepoint(sys, name)
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perf.evsel.__init__(self,
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type = perf.TYPE_TRACEPOINT,
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config = config,
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freq = 0, sample_period = 1, wakeup_events = 1,
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sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
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def main():
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tp = tracepoint("sched", "sched_switch")
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cpus = perf.cpu_map()
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threads = perf.thread_map(-1)
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evlist = perf.evlist(cpus, threads)
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evlist.add(tp)
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evlist.open()
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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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if not isinstance(event, perf.sample_event):
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continue
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print "time %u prev_comm=%s prev_pid=%d prev_prio=%d prev_state=0x%x ==> next_comm=%s next_pid=%d next_prio=%d" % (
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event.sample_time,
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event.prev_comm,
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event.prev_pid,
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event.prev_prio,
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event.prev_state,
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event.next_comm,
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event.next_pid,
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event.next_prio)
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if __name__ == '__main__':
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main()
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