timer/linux: prevent 64-bit overflow #2721
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The linux timer code was multiplying the result of the x86 time stamp counter by 1000000 before dividing by the cpu frequency. This can cause us to overflow 64 bits if the time stamp counter grows larger than ~ 1.8e13 (about 8400 seconds after boot). To fix the issue the units of opal_timer_linux_freq have been changed to MHz. Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov> (cherry picked from commit 45c0588) Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
Contributor
|
bot:mellanox:retest |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The linux timer code was multiplying the result of the x86 time stamp
counter by 1000000 before dividing by the cpu frequency. This can
cause us to overflow 64 bits if the time stamp counter grows larger
than ~ 1.8e13 (about 8400 seconds after boot). To fix the issue the
units of opal_timer_linux_freq have been changed to MHz.
Signed-off-by: Nathan Hjelm hjelmn@lanl.gov
(cherry picked from commit 45c0588)
Signed-off-by: Nathan Hjelm hjelmn@lanl.gov