Messages in this thread | | | Date | Fri, 9 Aug 2019 08:14:37 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH v4 9/9] printk: use a new ringbuffer implementation |
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On Thu, Aug 08, 2019 at 12:07:28PM -0700, Linus Torvalds wrote:
> End result: a DRAM buffer can work, but is not "reliable". > Particularly if you turn power on and off, data retention of DRAM is > iffy. But it's possible, at least in theory. > > So I have a patch that implements a "stupid ring buffer" for thisa > case, with absolutely zero data structures (because in the presense of > DRAM corruption, all you can get is "hopefully only slightly garbled > ASCII".
Note that you can hook this into printk as a fake early serial device; just have the serial device write to the DRAM buffer.
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