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mirror of https://git.FreeBSD.org/src.git synced 2024-12-27 11:55:06 +00:00
freebsd/sys/security
Robert Watson 4795b82c13 Coalesce pipe allocations and frees. Previously, the pipe code
would allocate two 'struct pipe's from the pipe zone, and malloc a
mutex.

- Create a new "struct pipepair" object holding the two 'struct
  pipe' instances, struct mutex, and struct label reference.  Pipe
  structures now have a back-pointer to the pipe pair, and a
  'pipe_present' flag to indicate whether the half has been
  closed.

- Perform mutex init/destroy in zone init/destroy, avoiding
  reallocating the mutex for each pipe.  Perform most pipe structure
  setup in zone constructor.

- VM memory mappings for pageable buffers are still done outside of
  the UMA zone.

- Change MAC API to speak 'struct pipepair' instead of 'struct pipe',
  update many policies.  MAC labels are also handled outside of the
  UMA zone for now.  Label-only policy modules don't have to be
  recompiled, but if a module is recompiled, its pipe entry points
  will need to be updated.  If a module actually reached into the
  pipe structures (unlikely), that would also need to be modified.

These changes substantially simplify failure handling in the pipe
code as there are many fewer possible failure modes.

On half-close, pipes no longer free the 'struct pipe' for the closed
half until a full-close takes place.  However, VM mapped buffers
are still released on half-close.

Some code refactoring is now possible to clean up some of the back
references, etc; this patch attempts not to change the structure
of most of the pipe implementation, only allocation/free code
paths, so as to avoid introducing bugs (hopefully).

This cuts about 8%-9% off the cost of sequential pipe allocation
and free in system call tests on UP and SMP in my micro-benchmarks.
May or may not make a difference in macro-benchmarks, but doing
less work is good.

Reviewed by:	juli, tjr
Testing help:	dwhite, fenestro, scottl, et al
2004-02-01 05:56:51 +00:00
..
mac Coalesce pipe allocations and frees. Previously, the pipe code 2004-02-01 05:56:51 +00:00
mac_biba Coalesce pipe allocations and frees. Previously, the pipe code 2004-02-01 05:56:51 +00:00
mac_bsdextended Implementations of mpo_check_vnode_deleteextattr() and 2003-08-21 14:34:54 +00:00
mac_ifoff Introduce a MAC label reference in 'struct inpcb', which caches 2003-11-18 00:39:07 +00:00
mac_lomac Coalesce pipe allocations and frees. Previously, the pipe code 2004-02-01 05:56:51 +00:00
mac_mls Coalesce pipe allocations and frees. Previously, the pipe code 2004-02-01 05:56:51 +00:00
mac_none mac_none is now the null policy, not a stub policy, so remove the 2003-08-21 16:19:17 +00:00
mac_partition Rename mac_create_cred() MAC Framework entry point to mac_copy_cred(), 2003-12-06 21:48:03 +00:00
mac_portacl Pay attention to mac_portacl_enabled. 2004-01-20 18:33:02 +00:00
mac_seeotheruids
mac_stub Switch TCP over to using the inpcb label when responding in timed 2003-12-17 14:55:11 +00:00
mac_test Coalesce pipe allocations and frees. Previously, the pipe code 2004-02-01 05:56:51 +00:00