https://github.com/torvalds/linux
Revision 6f42249fecb94dfb6514ed241475f748c03d62fb authored by Steven Rostedt (Google) on 05 March 2024, 00:13:42 UTC, committed by Steven Rostedt (Google) on 06 March 2024, 18:27:00 UTC
The trace_seq buffer is used to print out entire events. It's typically set to PAGE_SIZE * 2 as there's some events that can be quite large. As a side effect, writes to trace_marker is limited by both the size of the trace_seq buffer as well as the ring buffer's sub-buffer size (which is a power of PAGE_SIZE). By limiting the trace_seq size, it also limits the size of the largest string written to trace_marker. trace_seq does not need to be dependent on PAGE_SIZE like the ring buffer sub-buffers need to be. Hard code it to 8K which is PAGE_SIZE * 2 on most architectures. This will also limit the size of trace_marker on those architectures with greater than 4K PAGE_SIZE. Link: https://lore.kernel.org/all/20240302111244.3a1674be@gandalf.local.home/ Link: https://lore.kernel.org/linux-trace-kernel/20240304191342.56fb1087@gandalf.local.home Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Sachin Sant <sachinp@linux.ibm.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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Tip revision: 6f42249fecb94dfb6514ed241475f748c03d62fb authored by Steven Rostedt (Google) on 05 March 2024, 00:13:42 UTC
tracing: Limit trace_seq size to just 8K and not depend on architecture PAGE_SIZE
tracing: Limit trace_seq size to just 8K and not depend on architecture PAGE_SIZE
Tip revision: 6f42249
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| .cocciconfig | -rw-r--r-- | 59 bytes |
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| .get_maintainer.ignore | -rw-r--r-- | 151 bytes |
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| COPYING | -rw-r--r-- | 496 bytes |
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| Kbuild | -rw-r--r-- | 2.5 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 724.0 KB |
| Makefile | -rw-r--r-- | 66.1 KB |
| README | -rw-r--r-- | 727 bytes |
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