powerpc/imc: Add documentation for IMC and trace-mode
Documentation for IMC (In-Memory Collection Counters) infrastructure and trace-mode of IMC. Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com> [mpe: Convert to rst, minor rewording, make PMI example more concise] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191028100816.6270-1-mpe@ellerman.id.au
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