alloc_tag: expose boot-time compression configuration

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Currently, userspace has limited visibility into the exact active runtime
state of memory allocation profiling and its page extension compression
('sysctl.vm.mem_profiling={0|1|never}[,compressed]').

While reading the sysctl provides basic on/off status, it is currently
impossible for userspace to natively determine whether page-tag
compression was successfully enabled without scraping dmesg boot logs.

Add a new read-only sysctl representing how compression was configured
at boot time.

Link: https://lore.kernel.org/c795f8089f82841e8a6e00d7ca286da2b23aeb7b.1785950530.git.abhishekbapat@google.com
Signed-off-by: Abhishek Bapat <abhishekbapat@google.com>
Acked-by: Suren Baghdasaryan <surenb@google.com>
Cc: Hao Ge <hao.ge@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Abhishek Bapat 2026-08-05 17:29:52 +00:00 • committed by Andrew Morton

parent bb3e3c5c2d

commit afff109c2f

2 changed files with 17 additions and 0 deletions

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11

Documentation/mm/allocation-profiling.rst

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6

mm/alloc_tag.c

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