linux主板转储恢复

Question

I vaguely remember a kernel extension where the last few KB of logging was saved to some ram on suitable motherboards. This let you recover the dump from an oops/panic on the next boot. Very useful for server farms.

Does anyone remember what that extension was called? Or the motherboard feature to have that storage.

Is there a way to set aside some RAM and save it there instead (for an embedded system)?

Answer 1

Originally this was the feature of Android kernel called RAM console . It can be enabled using CONFIG_ANDROID_RAM_CONSOLE option.

Now the similar mechanism called pstore is available in mainline kernel (was added by this commit). You can enable it using CONFIG_PSTORE_* options.

More details about RAM console upstreaming can be found here .