CONFIG_QUEUED_SPINLOCKS_TRACE_CONTENDED_RELEASE: Trace contended_release on queued spinlocks

General informations

The Linux kernel configuration item CONFIG_QUEUED_SPINLOCKS_TRACE_CONTENDED_RELEASE:

• prompt: Trace contended_release on queued spinlocks
• type: bool
• depends on: CONFIG_QUEUED_SPINLOCKS && CONFIG_TRACEPOINTS
• defined in kernel/Kconfig.locks
• found in Linux kernels: 7.3-rc+HEAD

Help text

Fire the lock:contended_release tracepoint when a contended queued spinlock is released, so it is possible to attribute a contended spinlock to its holder.

Architectures that can patch the unlock site do this at no cost and do not need this option.

Everywhere else the check is compiled into queued_spin_unlock() and a small cost is paid on every unlock even when the tracepoint is disabled: a static-branch NOP and possibly a few more instructions to manage a stack frame.

Sleeping locks fire lock:contended_release regardless of this option.

If unsure, say N.

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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