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9e5d25e829
The first is something that's been there since its creation. If a reader reads a page out of the ring buffer before there's any events on it, it can get an out of date timestamp for that event. It may be off by a few microseconds, more if the first event gets discarded. The fix was to only update the reader time stamp when it actually sees an event on the page, instead of just reading the timestamp from the page even if it has no events on it. That timestamp is still volatile until an event is present. The second bug is more recent. Instead of passing around parameters a descriptor was made and the parameters are passed via a single descriptor. This simplified the code a bit. But there was one place that expected the parameter to be passed by value not reference (which a descriptor now does). And it added to the length of the event, which may be ignored later, but the length should not have been increased. The only real problem with this bug is that it may allocate more than was needed for the event. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJWVdKDAAoJEKKk/i67LK/8dYwH/15HYLvVMbljmXyatXOp+zO9 VTJAfXuLowMNLWMEg57NjDkcmqKodQfVWEY1gW8dgY3VnUa6KbbWgcX++3ncnXtH RwRQ8YhgTCpz9rFmIKesSBuLpu0uE1naqGn9QSF0AaU48ljykDStXBJJs7QGBCB8 ZDFru17sFT5/BpeE/zcTrDKmUH79YSWbmnQvcp4UxdP3Eq7THvd41bOEoUrvm/zU pA2I/+Yz8wUJMA9I4UHEkltoMSV46/QldXbSh+zzWoTdZp92ZAiyuNNO/EtamGa+ QVS6cU3b9N9C6EGom21PaSheNUpZDrZf5Tj0S0wrg2f/+lWublplRJNzwhSu85E= =K6x5 -----END PGP SIGNATURE----- Merge tag 'trace-v4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: "I found two minor bugs while doing development on the ring buffer code. The first is something that's been there since its creation. If a reader reads a page out of the ring buffer before there's any events on it, it can get an out of date timestamp for that event. It may be off by a few microseconds, more if the first event gets discarded. The fix was to only update the reader time stamp when it actually sees an event on the page, instead of just reading the timestamp from the page even if it has no events on it. That timestamp is still volatile until an event is present. The second bug is more recent. Instead of passing around parameters a descriptor was made and the parameters are passed via a single descriptor. This simplified the code a bit. But there was one place that expected the parameter to be passed by value not reference (which a descriptor now does). And it added to the length of the event, which may be ignored later, but the length should not have been increased. The only real problem with this bug is that it may allocate more than was needed for the event" * tag 'trace-v4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ring-buffer: Put back the length if crossed page with add_timestamp ring-buffer: Update read stamp with first real commit on page |
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| events | ||
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| irq | ||
| livepatch | ||
| locking | ||
| power | ||
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