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tracing: Add bitmask-list option for human-readable bitmask display

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Add support for displaying bitmasks in human-readable list format (e.g.,
0,2-5,7) in addition to the default hexadecimal bitmap representation.
This is particularly useful when tracing CPU masks and other large
bitmasks where individual bit positions are more meaningful than their
hexadecimal encoding.

When the "bitmask-list" option is enabled, the printk "%*pbl" format
specifier is used to render bitmasks as comma-separated ranges, making
trace output easier to interpret for complex CPU configurations and
large bitmask values.

Link: https://patch.msgid.link/20251226160724.2246493-2-atomlin@atomlin.com
Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Aaron Tomlin
2025-12-26 11:07:24 -05:00
committed by Steven Rostedt (Google)
parent a4e0ea0e10
commit 2cddfc2e8f
7 changed files with 82 additions and 11 deletions
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9
Documentation/trace/ftrace.rst
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@@ -1290,6 +1290,15 @@ Here are the available options:
This will be useful if you want to find out which hashed
value is corresponding to the real value in trace log.
bitmask-list
When enabled, bitmasks are displayed as a human-readable list of
ranges (e.g., 0,2-5,7) using the printk "%*pbl" format specifier.
When disabled (the default), bitmasks are displayed in the
traditional hexadecimal bitmap representation. The list format is
particularly useful for tracing CPU masks and other large bitmasks
where individual bit positions are more meaningful than their
hexadecimal encoding.
record-cmd
When any event or tracer is enabled, a hook is enabled
in the sched_switch trace point to fill comm cache