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| author | jhb <jhb@FreeBSD.org> | 2006-03-07 22:12:09 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2006-03-07 22:12:09 +0000 |
| commit | 13d9bffa825005efe48317fcc02c663f2bbd263c (patch) | |
| tree | b21aa5fb171ca86832d883d893bcfd9f58587633 /sys/ddb | |
| parent | 59bd3cfe60b44d5bde9042b768e1642116a4946e (diff) | |
| download | FreeBSD-src-13d9bffa825005efe48317fcc02c663f2bbd263c.zip FreeBSD-src-13d9bffa825005efe48317fcc02c663f2bbd263c.tar.gz | |
Use the Alpha PCC as a cpu ticker for process runtime accounting. This is
slightly more tricky than on x86 as although the PCC is 64-bits, it is not
a simple 64-bit counter like the TSC. Instead, the upper 32-bits have
PAL-defined behavior and the lower 32-bits run as a free-running 32-bit
counter. To handle this, we detect overflows by maintaining a small amount
of per-cpu state and use this to simulate the upper 32-bits of the counter
providing a full 64-bit counter to the consumers of cpu_ticks().
Diffstat (limited to 'sys/ddb')
0 files changed, 0 insertions, 0 deletions
