diff options
| author | Mohammed Khajapasha <mkhaja@codeaurora.org> | 2015-09-04 20:33:31 +0530 |
|---|---|---|
| committer | Gerrit - the friendly Code Review server <code-review@localhost> | 2018-09-06 04:04:46 -0700 |
| commit | 20f23e546e28898062efb3ed6c7e6f7a5585c099 (patch) | |
| tree | a48109500d0c93247b49b6fbfcced7c3a23937f3 /init/Kconfig | |
| parent | 6aab18ee11149b4e2d00c0fd8da3a54661979226 (diff) | |
printk: Make the console flush configurable in hotplug path
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 <mkhaja@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index ec2342b3befe..a73b64531d69 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -850,6 +850,16 @@ 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 |