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Commit 361dba0c authored by Poul-Henning Kamp's avatar Poul-Henning Kamp
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Update comment about VSL layout

parent b5443cc8
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Showing with 14 additions and 4 deletions
include/vapi/vsl_int.h
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......@@ -50,10 +50,20 @@
* The log member points to an array of 32bit unsigned integers containing
* log records.
*
* Each logrecord consist of:
* [n] = ((type & 0xff) << 24) | (length & 0xffff)
* [n + 1] = ((marker & 0x03) << 30) | (identifier & 0x3fffffff)
* [n + 2] ... [m] = content (NUL-terminated)
* Each logrecord consist of four or more 32 bit words, stored in
* native endiansess:
*
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | TAG | unused |ver| length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | 32 lower bits of VXID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |B|C| unused (zero) | 19 upper bits of VXID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | content ... (NUL-terminated) |
* +-+-+ +-+-+
* | ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* Logrecords are NUL-terminated so that string functions can be run
* directly on the shmlog data.
......
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