Библиотека сайта rus-linux.net
The book is available and called simply "Understanding The Linux Virtual Memory Manager". There is a lot of additional material in the book that is not available here, including details on later 2.4 kernels, introductions to 2.6, a whole new chapter on the shared memory filesystem, coverage of TLB management, a lot more code commentary, countless other additions and clarifications and a CD with lots of cool stuff on it. This material (although now dated and lacking in comparison to the book) will remain available although I obviously encourge you to buy the book from your favourite book store :-) . As the book is under the Bruce Perens Open Book Series, it will be available 90 days after appearing on the book shelves which means it is not available right now. When it is available, it will be downloadable from http://www.phptr.com/perens so check there for more information.
To be fully clear, this webpage is not the actual book.
Next: 9.7 Interfacing with the Up: 9. Slab Allocator Previous: 9.5 Per-CPU Object Cache Contents Index
9.6 Slab Allocator Initialisation
Here we will describe how the slab allocator initialises itself. When the slab
allocator creates a new cache, it allocates the kmem_cache_t
from the cache_cache or kmem_cache
cache. This is an obvious chicken and egg problem so the
cache_cache has to be statically initialised as
357 static kmem_cache_t cache_cache = {
358 slabs_full: LIST_HEAD_INIT(cache_cache.slabs_full),
359 slabs_partial: LIST_HEAD_INIT(cache_cache.slabs_partial),
360 slabs_free: LIST_HEAD_INIT(cache_cache.slabs_free),
361 objsize: sizeof(kmem_cache_t),
362 flags: SLAB_NO_REAP,
363 spinlock: SPIN_LOCK_UNLOCKED,
364 colour_off: L1_CACHE_BYTES,
365 name: "kmem_cache",
366 };
This code statically initialised the kmem_cache_t struct
as follows:
- 358-360 Initialise the three lists as empty lists;
- 361 The size of each object is the size of a cache descriptor;
- 362 The creation and deleting of caches is extremely rare so do not
consider it for reaping ever;
- 363 Initialise the spinlock unlocked;
- 364 Align the objects to the L1 cache;
- 365 Record the human readable name.
That statically defines all the fields that can be calculated at compile time.
To initialise the rest of the struct, kmem_cache_init() is
called from start_kernel().
Next: 9.7 Interfacing with the Up: 9. Slab Allocator Previous: 9.5 Per-CPU Object Cache Contents Index Mel 2004-02-15