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2c991e408d
Markus reported that BTS is sporadically missing the tail of the trace
in the perf_event data buffer: [decode error (1): instruction overflow]
shown in GDB; and bisected it to the conversion of debug_store to PTI.
A little "optimization" crept into alloc_bts_buffer(), which mistakenly
placed bts_interrupt_threshold away from the 24-byte record boundary.
Intel SDM Vol 3B 17.4.9 says "This address must point to an offset from
the BTS buffer base that is a multiple of the BTS record size."
Revert "max" from a byte count to a record count, to calculate the
bts_interrupt_threshold correctly: which turns out to fix problem seen.
Fixes:
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.. | ||
bts.c | ||
core.c | ||
cstate.c | ||
ds.c | ||
knc.c | ||
lbr.c | ||
Makefile | ||
p4.c | ||
p6.c | ||
pt.c | ||
pt.h | ||
rapl.c | ||
uncore.c | ||
uncore.h | ||
uncore_nhmex.c | ||
uncore_snb.c | ||
uncore_snbep.c |