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printk: Make the console flush configurable in hotplug path

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The thread which initiates the hot plug can get scheduled
out, while trying to acquire the console lock,
thus increasing the hot plug latency. This option
allows to selectively disable the console flush and
in turn reduce the hot plug latency.

Change-Id: I42507804d321b29b7761146a6c175d959bf79925
Signed-off-by: Mohammed Khajapasha <[email protected]>
Signed-off-by: Elliot Berman <[email protected]>
This commit is contained in:
Mohammed Khajapasha 2015-09-04 20:33:31 +05:30 • committed by Elliot Berman
commit 29432c4eba
2 changed files with 18 additions and 2 deletions
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10
init/Kconfig
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@ -608,6 +608,16 @@ config LOG_BUF_SHIFT
13 => 8 KB
12 => 4 KB
config CONSOLE_FLUSH_ON_HOTPLUG
bool "Enable console flush configurable in hot plug code path"
depends on HOTPLUG_CPU
def_bool n
help
In cpu hot plug path console lock acquire and release causes the
console to flush. If console lock is not free hot plug latency
increases. So make console flush configurable in hot plug path
and default disabled to help in cpu hot plug latencies.
config LOG_CPU_MAX_BUF_SHIFT
int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)"
depends on SMP