This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1882039 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1882039 Title: The thread level parallelism would be a bottleneck when searching for the shared pmd by using hugetlbfs Status in linux package in Ubuntu: Incomplete Bug description: [Impact] There is performance overhead observed when many threads are using hugetlbfs in the database environment. [Fix] bdfbd98bc018 hugetlbfs: take read_lock on i_mmap for PMD sharing The patch improves the locking by using the read lock instead of the write lock. And it allows multiple threads searching the suitable shared VMA. As there is no modification inside the searching process. The improvement increases the parallelism and decreases the waiting time of the other threads. [Test] The customer stand-up a database with seed data. Then they have a loading "driver" which makes a bunch of connections that look like user workflows from the database perspective. Finally, the measuring response times improvement can be observed for these "users" as well as various other metrics at the database level. [Regression Potential] The modification is only in replacing the write lock to a read one. And there is no modification inside the loop. The regression probability is low. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1882039/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp