freebsd with flexible iflib nic queues
fab343a716
M_USE_RESERVE is used in a couple of places in the VM to avoid unbounded recursion when the direct map is not available, as is the case on 32-bit platforms or when certain kernel sanitizers (KASAN and KMSAN) are enabled. For example, to allocate KVA, the kernel might allocate a kernel map entry, which might require a new slab, which requires KVA. For these zones, we use uma_prealloc() to populate a reserve of items, and then in certain serialized contexts M_USE_RESERVE can be used to guarantee a successful allocation. uma_prealloc() allocates the requested number of items, distributing them evenly among NUMA domains. Thus, in a first-touch zone, to satisfy an M_USE_RESERVE allocation we might have to check the slab lists of other domains than the current one to provide the semantics expected by consumers. So, try harder to find an item if M_USE_RESERVE is specified and the keg doesn't have anything for current (first-touch) domain. Specifically, fall back to a round-robin slab allocation. This change fixes boot-time panics on NUMA systems with KASAN or KMSAN enabled.[1] Alternately we could have uma_prealloc() allocate the requested number of items for each domain, but for some existing consumers this would be quite wasteful. In general I think keg_fetch_slab() should try harder to find free slabs in other domains before trying to allocate fresh ones, but let's limit this to M_USE_RESERVE for now. Also fix a separate problem that I noticed: in a non-round-robin slab allocation with M_WAITOK, rather than sleeping after a failed slab allocation we simply try again. Call vm_wait_domain() before retrying. Reported by: mjg, tuexen [1] Reviewed by: alc MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32515 |
||
|---|---|---|
| .cirrus-ci | ||
| .github | ||
| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .cirrus.yml | ||
| .clang-format | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README.md | ||
| RELNOTES | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory.
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
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.