From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 23 Jan 2020 21:02:27 +0000 (-0500)
Subject: lib ring buffer: use irq_work for wakeup by writer
X-Git-Tag: v2.13.0-rc1~150
X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=fbd4d5586960a40e12dae11a70afe3a2ae239ba9;hp=fbd4d5586960a40e12dae11a70afe3a2ae239ba9;p=lttng-modules.git

lib ring buffer: use irq_work for wakeup by writer

Using irq_work (like perf does) allows using an interrupt handler
firing soon after the instrumentation execution to issue the wakeups.

This allows the RING_BUFFER_WAKEUP_BY_WRITER ring buffer configuration
to be entirely lock-free, which allows using it in NMI context for
general tracing purposes.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I842ff15736f53d1283cf953804d803f70779652b
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