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
50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
# futex contention
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# (c) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
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# Licensed under the terms of the GNU GPL License version 2
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#
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# Translation of:
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#
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# http://sourceware.org/systemtap/wiki/WSFutexContention
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#
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# to perf python scripting.
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#
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# Measures futex contention
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import os, sys
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sys.path.append(os.environ['PERF_EXEC_PATH'] + '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
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from Util import *
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process_names = {}
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thread_thislock = {}
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thread_blocktime = {}
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lock_waits = {} # long-lived stats on (tid,lock) blockage elapsed time
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process_names = {} # long-lived pid-to-execname mapping
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def syscalls__sys_enter_futex(event, ctxt, cpu, s, ns, tid, comm, callchain,
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nr, uaddr, op, val, utime, uaddr2, val3):
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cmd = op & FUTEX_CMD_MASK
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if cmd != FUTEX_WAIT:
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return # we don't care about originators of WAKE events
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process_names[tid] = comm
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thread_thislock[tid] = uaddr
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thread_blocktime[tid] = nsecs(s, ns)
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def syscalls__sys_exit_futex(event, ctxt, cpu, s, ns, tid, comm, callchain,
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nr, ret):
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if thread_blocktime.has_key(tid):
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elapsed = nsecs(s, ns) - thread_blocktime[tid]
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add_stats(lock_waits, (tid, thread_thislock[tid]), elapsed)
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del thread_blocktime[tid]
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del thread_thislock[tid]
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def trace_begin():
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print "Press control+C to stop and show the summary"
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def trace_end():
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for (tid, lock) in lock_waits:
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min, max, avg, count = lock_waits[tid, lock]
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print "%s[%d] lock %x contended %d times, %d avg ns" % \
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(process_names[tid], tid, lock, count, avg)
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