glebius 163857deb4 New way to manage reference counting of mbuf external storage. ... The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix		2016-03-01 00:17:14 +00:00
..
amd64	Bump VM_MAX_MEMSEGS from 2 to 3 to match the number of VM segment	2016-02-26 16:18:47 +00:00
arm	Fix fdt_get_mem_regions() to work with 64-bit addresses	2016-02-29 09:22:39 +00:00
arm64	Restore ThunderX Pass1.1 PCI changes removed by r295962	2016-02-26 12:16:11 +00:00
boot	userboot: use MK_CTF=no to disable CTF	2016-02-29 17:54:55 +00:00
bsm	Merge from contrib/openbsm to bring the kernel audit bits up to date with OpenBSM 1.2 alpha 4:	2015-12-20 23:22:04 +00:00
cam	Remove a stray else. It isn't needed (due to the return at the end of	2016-02-18 15:12:52 +00:00
cddl	Removed unused label and fix mutex_exit order	2016-02-25 03:01:24 +00:00
compat	Improve error handling for posix_fallocate(2) and posix_fadvise(2).	2016-02-25 19:58:23 +00:00
conf	FAST_DEPEND: Prefer .OBJDIR depend files.	2016-02-29 21:10:47 +00:00
contrib	Add support for the Freescale dTSEC DPAA-based ethernet controller.	2016-02-29 03:38:00 +00:00
crypto	Break up opencrypto/xform.c so it can be reused piecemeal	2015-12-30 22:43:07 +00:00
ddb	Add helper to catch single step debug event and distinguish it from bkpt	2015-11-27 19:03:59 +00:00
dev	New way to manage reference counting of mbuf external storage.	2016-03-01 00:17:14 +00:00
fs	Ext2: cleanup setting of ctime/mtime/birthtime.	2016-02-19 15:53:08 +00:00
gdb
geom	Fixes to make it compile under gcc-4.2.	2016-02-24 02:52:49 +00:00
gnu	Update our copy of the Linux dts files to be in sync with Linux 4.5-rc1. We	2016-02-09 16:42:32 +00:00
i386	Migrate many bus_alloc_resource() calls to bus_alloc_resource_anywhere().	2016-02-27 03:38:01 +00:00
isa	Replace several bus_alloc_resource() calls using default arguments with bus_alloc_resource_any()	2016-02-19 03:37:56 +00:00
kern	New way to manage reference counting of mbuf external storage.	2016-03-01 00:17:14 +00:00
kgssapi	kcrypto_aes: Use separate sessions for AES and SHA1	2016-02-02 00:14:51 +00:00
libkern	libkern: ffs, fls: s/4/3/ the 3rd BSD clause	2015-10-22 21:04:47 +00:00
mips	Fix fdt_get_mem_regions() to work with 64-bit addresses	2016-02-29 09:22:39 +00:00
modules	Add modules support for the bhnd code.	2016-02-26 03:34:32 +00:00
net	buf_ring/drbr: Add buf_ring_peek_clear_sc and use it in drbr_peek	2016-02-29 03:54:51 +00:00
net80211	Fix !IEEE80211_DEBUG build.	2016-02-29 23:09:31 +00:00
netgraph	Migrate many bus_alloc_resource() calls to bus_alloc_resource_anywhere().	2016-02-27 03:38:01 +00:00
netinet	Fix build after r29592.	2016-02-23 21:21:47 +00:00
netinet6	New way to manage reference counting of mbuf external storage.	2016-03-01 00:17:14 +00:00
netipsec	Fix useless check. m_pkthdr.len should be equal to orglen.	2016-02-24 12:28:49 +00:00
netnatm
netpfil	pf: Fix possible out-of-bounds write	2016-02-25 07:33:59 +00:00
netsmb	The problem report was for a crash that happened when smbfs was	2015-11-18 23:04:01 +00:00
nfs	MFP r287070,r287073: split radix implementation and route table structure.	2016-01-25 06:33:15 +00:00
nfsclient
nfsserver
nlm
ofed	LinuxKPI list updates:	2016-01-26 15:12:31 +00:00
opencrypto	Break up opencrypto/xform.c so it can be reused piecemeal	2015-12-30 22:43:07 +00:00
pc98	Migrate many bus_alloc_resource() calls to bus_alloc_resource_anywhere().	2016-02-27 03:38:01 +00:00
powerpc	Add support for the Freescale dTSEC DPAA-based ethernet controller.	2016-02-29 03:38:00 +00:00
riscv	Fix fdt_get_mem_regions() to work with 64-bit addresses	2016-02-29 09:22:39 +00:00
rpc	These files were getting sys/malloc.h and vm/uma.h with header pollution	2016-02-01 17:41:21 +00:00
security	Busy the mount point which is the owner of the audit vnode, around	2016-01-16 10:06:33 +00:00
sparc64	As <machine/pmap.h> is included from <vm/pmap.h>, there is no need to	2016-02-22 09:02:20 +00:00
sys	New way to manage reference counting of mbuf external storage.	2016-03-01 00:17:14 +00:00
teken
tests	Style 9 changes.	2015-11-12 10:31:14 +00:00
tools	Fix MFS builds when both MD_ROOT_SIZE and MFS_IMAGE are specified	2016-02-02 07:02:51 +00:00
ufs	The UFS filesystem requires that the last block of a file always be	2016-02-24 01:58:40 +00:00
vm	Implement process-shared locks support for libthr.so.3, without	2016-02-28 17:52:33 +00:00
x86	Silence PVS-Studio warning (V595). It can never be NULL here.	2016-02-23 23:57:24 +00:00
xdr
xen	xenbus: add a comment with the names of the generated accessors	2016-01-15 14:34:31 +00:00
Makefile	Add riscv to the list of architectures for cscope.	2016-02-29 16:39:27 +00:00