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Diffstat (limited to 'src/vpp/stats/stats.md')
| -rw-r--r-- | src/vpp/stats/stats.md | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vpp/stats/stats.md b/src/vpp/stats/stats.md index d66c31bb636..dd14a188e47 100644 --- a/src/vpp/stats/stats.md +++ b/src/vpp/stats/stats.md @@ -36,7 +36,7 @@ typedef struct { ``` #### Writer -On the VPP side there is a single writer (controlled by a spinlock). When the writer starts it sets in_progress=1, continues with the update of the data-structues, and when done, bumps epoch++ and sets in_progress=0. +On the VPP side there is a single writer (controlled by a spinlock). When the writer starts it sets in_progress=1, continues with the update of the data-structures, and when done, bumps epoch++ and sets in_progress=0. #### Readers If in_progress=1, there is no point continuing, so reader sits spinning on the in_progress flag until it is 0. Then it sets start_epoch = epoch and continues copying out the counter data it is interested in, while doing strict boundary checks on all offsets / pointers. When the reader is done, it checks if in_progress=1 or if epoch != start_epoch. If either of those are true is discards the data read. |