Jeff Moyer <jmoyer@xxxxxxxxxx> writes: > FYI, this kernel has issues. It will boot up, but I don't have > networking, and even rebooting doesn't succeed. I'm looking into it. A bisect lands on: eventfd: switch to ->poll_mask. That's not super helpful, though. I did run the ltp eventfd2 tests, and they all pass. The actual issue I get on boot is that several services don't start: [FAILED] Failed to start Modem Manager. See 'systemctl status ModemManager.service' for details. [FAILED] Failed to start Authorization Manager. See 'systemctl status polkit.service' for details. [DEPEND] Dependency failed for Dynamic System Tuning Daemon. [FAILED] Failed to start Network Manager. See 'systemctl status NetworkManager.service' for details. [DEPEND] Dependency failed for Network Manager Wait Online. ... Christoph, are you able to reproduce this? -Jeff > Christoph Hellwig <hch@xxxxxx> writes: > >> Hi all, >> >> this series adds support for the IOCB_CMD_POLL operation to poll for the >> readyness of file descriptors using the aio subsystem. The API is based >> on patches that existed in RHAS2.1 and RHEL3, which means it already is >> supported by libaio. To implement the poll support efficiently new >> methods to poll are introduced in struct file_operations: get_poll_head >> and poll_mask. The first one returns a wait_queue_head to wait on >> (lifetime is bound by the file), and the second does a non-blocking >> check for the POLL* events. This allows aio poll to work without >> any additional context switches, unlike epoll. >> >> To make the interface fully useful a new io_pgetevents system call is >> added, which atomically saves and restores the signal mask over the >> io_pgetevents system call. It it the logical equivalent to pselect and >> ppoll for io_pgetevents. >> >> The corresponding libaio changes for io_pgetevents support and >> documentation, as well as a test case will be posted in a separate >> series. >> >> The changes were sponsored by Scylladb, and improve performance >> of the seastar framework up to 10%, while also removing the need >> for a privileged SCHED_FIFO epoll listener thread. >> >> The patches are on top of Als __poll_t annoations, so I've also >> prepared a git branch on top of those here: >> >> git://git.infradead.org/users/hch/vfs.git aio-poll.3 >> >> Gitweb: >> >> http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/aio-poll.3 >> >> Libaio changes: >> >> https://pagure.io/libaio.git io-poll >> >> Seastar changes (not updated for the new io_pgetevens ABI yet): >> >> https://github.com/avikivity/seastar/commits/aio >> >> Changes since V2: >> - removed a double initialization >> - new vfs_get_poll_head helper >> - document that ->get_poll_head can return NULL >> - call ->poll_mask before sleeping >> - various ACKs >> - add conversion of random to ->poll_mask >> - add conversion of af_alg to ->poll_mask >> - lacking ->poll_mask support now returns -EINVAL for IOCB_CMD_POLL >> - reshuffled the series so that prep patches and everything not >> requiring the new in-kernel poll API is in the beginning >> >> Changes since V1: >> - handle the NULL ->poll case in vfs_poll >> - dropped the file argument to the ->poll_mask socket operation >> - replace the ->pre_poll socket operation with ->get_poll_head as >> in the file operations >> >> -- >> To unsubscribe, send a message with 'unsubscribe linux-aio' in >> the body to majordomo@xxxxxxxxx. For more info on Linux AIO, >> see: http://www.kvack.org/aio/ >> Don't email: <a href=mailto:"aart@xxxxxxxxx";>aart@xxxxxxxxx</a> > > -- > To unsubscribe, send a message with 'unsubscribe linux-aio' in > the body to majordomo@xxxxxxxxx. For more info on Linux AIO, > see: http://www.kvack.org/aio/ > Don't email: <a href=mailto:"aart@xxxxxxxxx";>aart@xxxxxxxxx</a>
