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9ecfb2f728
- Do not invalidate entire buffer for invalid sub-buffers For the persistent ring buffer, if one sub-buffer is found to be invalid, it invalidates the entire per CPU ring buffer. This can lose a lot of valuable data if there's some corruption with the writes to the buffer not syncing properly on a hard crash. Instead, if a sub-buffer is found to be invalid, simply zero it out and mark it for "missed events". When the persistent ring buffer is read and a sub-buffer that was cleared due to being invalid on boot up is discovered, the output will show "[LOST EVENTS]" to let the user know that events were missing at that location. Displaying the events from valid buffers can still be useful. - Add a test to be able to test corrupted sub-buffers If a persistent ring buffer is created as "ptraingtest" and the new config that adds the test is enabled, when a panic happens, the kernel will randomly corrupt one of the per CPU ring buffers. On boot up, the sub-buffers with the corruption should be cleared and flagged. When reading this buffer, the missed events should should [LOST EVENTS]. - Add commit number in the sub-buffer meta debug info The commit is used to know the content of a meta page. Add it to the buffer_meta file that is shown for each per CPU buffer. - Clean up the persistent ring buffer validation code Add some helper functions and make variable names more consistent. -----BEGIN PGP SIGNATURE----- iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCajMDZBQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qhDLAP4i0b8HP159LOEy/IiQKZ7hfAaUhTK8 imMVS6V1bVKTjgD8Dy/f9m8259ZIcgN9mjSKXlT30qAeGmhjjDCdc0TnagM= =mokF -----END PGP SIGNATURE----- Merge tag 'trace-ring-buffer-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull ring-buffer updates from Steven Rostedt - Do not invalidate entire buffer for invalid sub-buffers For the persistent ring buffer, if one sub-buffer is found to be invalid, it invalidates the entire per CPU ring buffer. This can lose a lot of valuable data if there's some corruption with the writes to the buffer not syncing properly on a hard crash. Instead, if a sub-buffer is found to be invalid, simply zero it out and mark it for "missed events". When the persistent ring buffer is read and a sub-buffer that was cleared due to being invalid on boot up is discovered, the output will show "[LOST EVENTS]" to let the user know that events were missing at that location. Displaying the events from valid buffers can still be useful. - Add a test to be able to test corrupted sub-buffers If a persistent ring buffer is created as "ptraingtest" and the new config that adds the test is enabled, when a panic happens, the kernel will randomly corrupt one of the per CPU ring buffers. On boot up, the sub-buffers with the corruption should be cleared and flagged. When reading this buffer, the missed events should should [LOST EVENTS]. - Add commit number in the sub-buffer meta debug info The commit is used to know the content of a meta page. Add it to the buffer_meta file that is shown for each per CPU buffer. - Clean up the persistent ring buffer validation code Add some helper functions and make variable names more consistent. * tag 'trace-ring-buffer-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Better comment the use of RB_MISSED_EVENTS ring-buffer: Show persistent buffer dropped events in trace_pipe file ring-buffer: Show persistent buffer dropped events in trace file ring-buffer: Have dropped subbuffers be persistent across reboots ring-buffer: Cleanup buffer_data_page related code ring-buffer: Cleanup persistent ring buffer validation ring-buffer: Show commit numbers in buffer_meta file ring-buffer: Add persistent ring buffer invalid-page inject test ring-buffer: Skip invalid sub-buffers when rewinding persistent ring buffer ring-buffer: Skip invalid sub-buffers when validating persistent ring buffer |
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| bpf | ||
| cgroup | ||
| configs | ||
| debug | ||
| dma | ||
| entry | ||
| events | ||
| futex | ||
| gcov | ||
| irq | ||
| kcsan | ||
| livepatch | ||
| liveupdate | ||
| locking | ||
| module | ||
| power | ||
| printk | ||
| rcu | ||
| sched | ||
| time | ||
| trace | ||
| unwind | ||
| .gitignore | ||
| acct.c | ||
| async.c | ||
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| audit_watch.c | ||
| audit.c | ||
| audit.h | ||
| auditfilter.c | ||
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| bounds.c | ||
| capability.c | ||
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| compat.c | ||
| configs.c | ||
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| cpu_pm.c | ||
| cpu.c | ||
| crash_core_test.c | ||
| crash_core.c | ||
| crash_dump_dm_crypt.c | ||
| crash_reserve.c | ||
| cred.c | ||
| delayacct.c | ||
| dma.c | ||
| elfcorehdr.c | ||
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| exit.h | ||
| extable.c | ||
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| fork.c | ||
| freezer.c | ||
| gen_kheaders.sh | ||
| groups.c | ||
| hung_task.c | ||
| iomem.c | ||
| irq_work.c | ||
| jump_label.c | ||
| kallsyms_internal.h | ||
| kallsyms_selftest.c | ||
| kallsyms_selftest.h | ||
| kallsyms.c | ||
| kcmp.c | ||
| Kconfig.freezer | ||
| Kconfig.hz | ||
| Kconfig.kexec | ||
| Kconfig.locks | ||
| Kconfig.preempt | ||
| kcov.c | ||
| kexec_core.c | ||
| kexec_elf.c | ||
| kexec_file.c | ||
| kexec_internal.h | ||
| kexec.c | ||
| kheaders.c | ||
| kprobes.c | ||
| kstack_erase.c | ||
| ksyms_common.c | ||
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| kthread.c | ||
| latencytop.c | ||
| Makefile | ||
| module_signature.c | ||
| notifier.c | ||
| nscommon.c | ||
| nsproxy.c | ||
| nstree.c | ||
| padata.c | ||
| panic.c | ||
| params.c | ||
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| pid.c | ||
| profile.c | ||
| ptrace.c | ||
| range.c | ||
| reboot.c | ||
| regset.c | ||
| relay.c | ||
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| rseq.c | ||
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| seccomp.c | ||
| signal.c | ||
| smp.c | ||
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| softirq.c | ||
| stacktrace.c | ||
| static_call_inline.c | ||
| static_call.c | ||
| stop_machine.c | ||
| sys_ni.c | ||
| sys.c | ||
| sysctl-test.c | ||
| sysctl.c | ||
| task_work.c | ||
| taskstats.c | ||
| torture.c | ||
| tracepoint.c | ||
| tsacct.c | ||
| ucount.c | ||
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| uid16.h | ||
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| user_namespace.c | ||
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| user.c | ||
| utsname_sysctl.c | ||
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| workqueue.c | ||