e9272225e6
The global list has a marker with an invariant that free vnodes are placed somewhere past that. A caller which performs filtering (like ZFS) can move said marker all the way to the end, across free vnodes which don't match. Then a caller which does not perform filtering will fail to find them. This makes vn_alloc_hard sleep for 1 second instead of reclaiming, resulting in significant stalls. Fix the problem by requiring an explicit marker by callers which do filtering. As a temporary measure extend vnlru_free to restart if it fails to reclaim anything. Big thanks go to the reporter for testing several iterations of the patch. Reported by: Yamagi <lists yamagi.org> Tested by: Yamagi <lists yamagi.org> Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D29324
FreeBSD Source:
This is the top level of the FreeBSD source directory.
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For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.
Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Various commands and libraries under the Common Development and Distribution License. |
| contrib | Packages contributed by 3rd parties. |
| crypto | Cryptography stuff (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Various commands and libraries under the GNU Public License. Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Kerberos5 (Heimdal) package. |
| lib | System libraries. |
| libexec | System daemons. |
| release | Release building Makefile & associated tools. |
| rescue | Build system for statically linked /rescue utilities. |
| sbin | System commands. |
| secure | Cryptographic libraries and commands. |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources. |
sys/arch/conf |
Kernel configuration files. GENERIC is the configuration used in release builds. NOTES contains documentation of all possible entries. |
| tests | Regression tests which can be run by Kyua. See tests/README for additional information. |
| tools | Utilities for regression testing and miscellaneous tasks. |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.