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How to find out who is calling futex system call on Linux?
https://stackoverflow.com/questions/45095245/how-to-find-out-who-is-calling-futex-system-call-on-linux
And how can I trace who is calling the futex system call? linux debugging system-calls. Share. Follow asked Jul 14, 2017 at 5:24. Wenlin.Wu Wenlin.Wu. 770 1 1 gold badge 9 9 silver badges 17 17 bronze badges. 3. You might use ltrace or study the source code of your libc implementation, probably glibc
futex() - Unix, Linux System Call - Tutorialspoint
https://www.tutorialspoint.com/unix_system_calls/futex.htm
Landing a new syscall, part 1: What is futex?
https://www.collabora.com/news-and-blog/blog/2022/02/08/landing-a-new-syscall-part-what-is-futex/
Now we call the futex() syscall. We use mutex as the first argument, since the memory address of our value is the identifier. The second argument is FUTEX_WAIT, that's the opcode to wait on this address until something wakes us (you can optionally use a timeout argument as well). The third argument is the value that we expect to find as the value of the …
Futex system calls taking too much time - Programmer All
https://programmerall.com/article/17372143913/
The futex () system call provides a method for waiting until a certain. condition becomes true. It is typically used as a blocking construct. in the context of shared-memory synchronization. When using futexes, the majority of the synchronization operations are performed in user. space.
futex(2) - Linux manual page - Michael Kerrisk
https://man7.org/linux/man-pages/man2/futex.2.html
When executing a futex operation that requests to block a thread, the kernel will block only if the futex word has the value that the calling thread supplied (as one of the arguments of the futex() call) as the expected value of the futex word. The loading of the futex word's value, the comparison of that value with the expected value, and the actual blocking will happen …
Strace – hanging at futex, FUTEX_WAIT – Meenakshi's Blog
https://meenakshi02.wordpress.com/2011/02/02/strace-hanging-at-futex/
futex(0xa280a0c, FUTEX_WAIT, 1, NULL. which simply means you are tracing the original parent thread, and it’s doing nothing but waiting for some other threads to finish. To get the pid’s of various threads executing in a single process, run the following command. ps -efL|grep <Process Name> This will show you something like below:
linux - Too many futex() calls - Stack Overflow
https://stackoverflow.com/questions/3407592/too-many-futex-calls
Assuming you did, one thing might be that a futex () syscall implies that the mutex is contended; FUTEX = fast user space mutex, uncontended mutexes are handled in user-space without a syscall. That is, you might have a problem with lock contention. answered Jun …
Linux client hangs in futex() call during startup
https://www.dropboxforum.com/t5/Dropbox-installs-integrations/Linux-client-hangs-in-futex-call-during-startup/td-p/2504
Tracing with "strace" reveals that the hang is in a call to "futex (0x295b1e0, FUTEX_WAIT_PRIVATE, 0, NULL)". Attaching a debugger to the hung process shows that we are down in some Python code. Most of the stack frames are either "PyEval_EvalCodeEx ()" or "PyEval_EvalFrameEx ()".
strace cheat sheet | Packagecloud Blog
https://blog.packagecloud.io/strace-cheat-sheet/
Exclude just the futex calls by using grep: strace strace -Tf ./program 2 >& 1 | grep -v futex. Or, trace a specific set of system calls you do care about. In this example, trace open, read, and write this program and its threads: strace -Tfe trace= open, read, write ./program.
Futex Cheat Sheet - Lockless Inc
http://locklessinc.com/articles/futex_cheat_sheet/
The timeout argument is overloaded as the number of waiters to transfer. If this is zero, then the operation is identical to FUTEX_WAKE. Typically this number will be 1, to just move one, or INT_MAX to transfer all waiters. Finally, the addr2 argument describes the destination Futex, where the waiters will end up on.
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