Skip to content

MDEV-40210 Redundant CAS in async_flush_lsn::try_clear_if_at_most() #5300

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
iMineLink merged 1 commit into from
Jun 30, 2026
+2 −0
Merged

MDEV-40210 Redundant CAS in async_flush_lsn::try_clear_if_at_most() #5300

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions storage/innobase/buf/buf0flu.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,8 @@ class async_flush_lsn
void try_clear_if_at_most(lsn_t threshold) noexcept
{
lsn_t snapshot= m_lsn.load();
if (!snapshot)
return; /* already cleared: avoid a redundant atomic CAS */
if (threshold >= snapshot)
m_lsn.compare_exchange_strong(snapshot, 0);
}
Expand Down