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freebsd-skq/lib/libc
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Mark Johnston 64910ddbff Launder VPO_NOSYNC pages upon vnode deactivation. 
As of r234483, vnode deactivation causes non-VPO_NOSYNC pages to be
laundered. This behaviour has two problems:

1. Dirty VPO_NOSYNC pages must be laundered before the vnode can be
   reclaimed, and this work may be unfairly deferred to the vnlru process
   or an unrelated application when the system is under vnode pressure.
2. Deactivation of a vnode with dirty VPO_NOSYNC pages requires a scan of
   the corresponding VM object's memq for non-VPO_NOSYNC dirty pages; if
   the laundry thread needs to launder pages from an unreferenced such
   vnode, it will reactivate and deactivate the vnode with each laundering,
   potentially resulting in a large number of expensive scans.

Therefore, ensure that all dirty pages are laundered upon deactivation,
i.e., when all maps of the vnode are removed and all references are
released.

Reviewed by:	alc, kib
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D8641
2016-11-26 21:00:27 +00:00
..
aarch64 Attach the cortex strings library to the build. Only a subset of functions 2016-09-19 15:08:03 +00:00
amd64 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
arm Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
capability
compat-43 Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:53:24 +00:00
db hash(3): protect in-memory page when using cross-endianness. 2016-09-26 16:06:50 +00:00
gdtoa META MODE: Don't create .meta files when symlinking sources into the obj directory. 2015-11-25 19:44:43 +00:00
gen remove unnecessary vm includes from setproctitle 2016-11-22 16:00:18 +00:00
gmon Replace the last non-optional use of sbrk() in the tree with mmap(). 2016-01-21 18:17:19 +00:00
i386 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
iconv citrus: Remove redundant code in _citrus_esdb_get_list(). 2016-06-02 17:28:39 +00:00
include Rewrite ptrace(2) wrappers in C. 2016-08-29 18:47:51 +00:00
inet Update ^/vendor/NetBSD/tests/dist to a more recent snapshot 2016-08-12 01:05:07 +00:00
isc libc: do not include <sys/types.h> where <sys/param.h> was already included 2016-04-18 21:05:15 +00:00
locale Fix error reporting from wcstof() 2016-11-20 20:13:22 +00:00
md
mips Add full softfloat and hardfloat support for MIPS. 2016-10-31 15:33:58 +00:00
nameser libc: spelling fixes. 2016-04-30 01:24:24 +00:00
net 'addrlen' does not matter when we need to find the first non-zero bit in 2016-08-31 18:49:50 +00:00
nls Use current locale (f.e. set by thread). It was global locale always 2016-08-24 16:44:27 +00:00
posix1e libc: spelling fixes. 2016-04-30 01:24:24 +00:00
powerpc Fix a typo which broke the build for powerpc. 2016-10-25 01:32:35 +00:00
powerpc64 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
powerpcspe Fix a copy&paste-o causing a segfault with sigsetjmp. 2016-10-29 01:22:55 +00:00
quad
regex 1) Eliminate possibility to call __*collate_range_cmp() with inclomplete 2016-07-14 09:07:25 +00:00
resolv Don't leak addrinfo if ai->ai_addrlen <= minsiz test fails. 2016-06-08 09:40:06 +00:00
riscv Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
rpc Update ^/vendor/NetBSD/tests/dist to a more recent snapshot 2016-08-12 01:05:07 +00:00
secure libc: do not include <sys/types.h> where <sys/param.h> was already included 2016-04-18 21:05:15 +00:00
softfloat Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
sparc64 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
stdio Detect integer overflow and limit the number of positional 2016-10-31 18:38:58 +00:00
stdlib Update jemalloc to 4.3.1. 2016-11-09 18:42:30 +00:00
stdtime 1) For already non-standard %z extension implement GNU compatible formats: 2016-09-21 15:47:40 +00:00
string Add timingsafe_bcmp and timingsafe_memcmp. 2016-08-14 23:38:50 +00:00
sys Launder VPO_NOSYNC pages upon vnode deactivation. 2016-11-26 21:00:27 +00:00
tests Only build lib/libc/tests/iconv if MK_ICONV != no 2016-10-21 04:54:43 +00:00
uuid libc: replace 0 with NULL for pointers. 2016-04-10 19:33:58 +00:00
x86/sys Implement userspace gettimeofday(2) with HPET timecounter. 2016-08-17 09:52:09 +00:00
xdr libc/xdr: unsign some loop indexes. 2016-05-06 16:03:40 +00:00
yp Use on crypto.x and rpc.x from the source tree. 2016-06-28 19:53:16 +00:00
libc_nossp.ldscript Add different libc ldscript: the one without libssp -- 2016-10-12 13:19:21 +00:00
libc.ldscript
Makefile Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
Makefile.depend DIRDEPS_BUILD: Regenerate without local dependencies. 2016-02-24 17:20:11 +00:00
Versions.def Create namespace for the symbols added during 12-CURRENT cycle. 2016-08-06 13:28:58 +00:00