[src/trunk]: src/sys/rump Introduce RUMP_CURLWP compile option to select curl...

[pooka <pooka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fb45b49f74b8
branches:  trunk
changeset: 327774:fb45b49f74b8
user:      pooka <pooka%NetBSD.org@localhost>
date:      Sun Mar 16 15:31:03 2014 +0000

description:
Introduce RUMP_CURLWP compile option to select curlwp scheme.
Default is still "hypercall".

diffstat:

 sys/rump/Makefile.rump      |  14 +++++++++++++-
 sys/rump/README.compileopts |  16 +++++++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diffs (58 lines):

diff -r 1d6d8a8d4b1a -r fb45b49f74b8 sys/rump/Makefile.rump
--- a/sys/rump/Makefile.rump    Sun Mar 16 15:30:05 2014 +0000
+++ b/sys/rump/Makefile.rump    Sun Mar 16 15:31:03 2014 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile.rump,v 1.93 2014/03/16 14:02:06 pooka Exp $
+#      $NetBSD: Makefile.rump,v 1.94 2014/03/16 15:31:03 pooka Exp $
 #
 
 WARNS?=                3       # XXX: src/sys won't compile with -Wsign-compare yet
@@ -53,6 +53,18 @@
 .endif
 .endif
 
+.if defined(RUMP_CURLWP)
+.if   ${RUMP_CURLWP} == "hypercall"
+CPPFLAGS+=     -DRUMP_CURLWP=RUMP_CURLWP_HYPERCALL
+.elif ${RUMP_CURLWP} == "__thread"
+CPPFLAGS+=     -DRUMP_CURLWP=RUMP_CURLWP___THREAD
+.elif ${RUMP_CURLWP} == "register"
+CPPFLAGS+=     -DRUMP_CURLWP=RUMP_CURLWP_REGISTER
+.else
+.error Unsupported curlwp scheme: ${RUMP_CURLWP}
+.endif
+.endif
+
 RUMP_DIAGNOSTIC?=yes
 .if ${RUMP_DIAGNOSTIC} == "yes"
 CPPFLAGS+=     -DDIAGNOSTIC
diff -r 1d6d8a8d4b1a -r fb45b49f74b8 sys/rump/README.compileopts
--- a/sys/rump/README.compileopts       Sun Mar 16 15:30:05 2014 +0000
+++ b/sys/rump/README.compileopts       Sun Mar 16 15:31:03 2014 +0000
@@ -1,4 +1,4 @@
-       $NetBSD: README.compileopts,v 1.2 2014/03/16 14:47:47 pooka Exp $
+       $NetBSD: README.compileopts,v 1.3 2014/03/16 15:31:03 pooka Exp $
 
 This file describes compile-time options for rump kernels.  Additionally,
 NetBSD build options will have an effect.  See src/share/mk/bsd.README
@@ -61,6 +61,20 @@
        e.g. musl libc based Linux.
 
 
+    RUMP_CURLWP
+
+values: hypercall/__thread/register or <undefined>
+defval: <undefined>
+effect: Control how curlwp is obtained in a rump kernel.  This is
+       a very frequently accessed thread-local variable, and optimizing
+       access has a significant performance impact.  Note that all
+       options are not available on hosts/machine architectures.
+       <undefined> - use default implementation (currently "hypercall")
+       hypercall   - use a hypercall to fetch the value
+       __thread    - use the __thread feature to fetch value via TLS
+       register    - use a dedicated register (implies -ffixed)
+
+
 ================================================================================