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
36 lines
2.2 KiB
Text
36 lines
2.2 KiB
Text
For a higher level overview, try: perf report --sort comm,dso
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Sample related events with: perf record -e '{cycles,instructions}:S'
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Compare performance results with: perf diff [<old file> <new file>]
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Boolean options have negative forms, e.g.: perf report --no-children
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Customize output of perf script with: perf script -F event,ip,sym
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Generate a script for your data: perf script -g <lang>
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Save output of perf stat using: perf stat record <target workload>
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Create an archive with symtabs to analyse on other machine: perf archive
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Search options using a keyword: perf report -h <keyword>
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Use parent filter to see specific call path: perf report -p <regex>
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List events using substring match: perf list <keyword>
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To see list of saved events and attributes: perf evlist -v
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Use --symfs <dir> if your symbol files are in non-standard locations
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To see callchains in a more compact form: perf report -g folded
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Show individual samples with: perf script
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Limit to show entries above 5% only: perf report --percent-limit 5
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Profiling branch (mis)predictions with: perf record -b / perf report
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Treat branches as callchains: perf report --branch-history
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To count events in every 1000 msec: perf stat -I 1000
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Print event counts in CSV format with: perf stat -x,
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If you have debuginfo enabled, try: perf report -s sym,srcline
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For memory address profiling, try: perf mem record / perf mem report
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For tracepoint events, try: perf report -s trace_fields
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To record callchains for each sample: perf record -g
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To record every process run by a user: perf record -u <user>
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Skip collecting build-id when recording: perf record -B
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To change sampling frequency to 100 Hz: perf record -F 100
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See assembly instructions with percentage: perf annotate <symbol>
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If you prefer Intel style assembly, try: perf annotate -M intel
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For hierarchical output, try: perf report --hierarchy
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Order by the overhead of source file name and line number: perf report -s srcline
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System-wide collection from all CPUs: perf record -a
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Show current config key-value pairs: perf config --list
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Show user configuration overrides: perf config --user --list
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To add Node.js USDT(User-Level Statically Defined Tracing): perf buildid-cache --add `which node`
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To report cacheline events from previous recording: perf c2c report
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