Re: [PATCH v1 1/3] coresight: etm-perf: Correct buffer syncing for snapshot
From: Leo Yan <hidden>
Date: 2021-06-09 01:40:33
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linux-perf-users, lkml
On Wed, Jun 09, 2021 at 09:35:55AM +0800, Leo Yan wrote: [...]
quoted
The problem with this approach is that if the AUX buffer is 4MB and the CS buffer is 1MB then we only record 1MB, but because of N:1 topologies we may not be able to do better. I haven't looked at the code yet, something I will do tomorrow.Yes, the fixing in this patch copies the trace data is limited by the CoreSight bounce buffer length. So if CoreSight buffer length is 1MiB, then we have no chance to allocate 4MiB for AUX buffer.
Sorry for typo, just correct: if CoreSight buffer length is 1MiB, then we have no chance to *copy* 4MiB trace data for AUX buffer. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel