Author: jtl
Date: Tue Mar 6 14:18:45 2018
New Revision: 330538
URL: https://svnweb.freebsd.org/changeset/base/330538
Log:
Nudge lld to break the kernel read-only and read-write sections into
separate 2M pages. The binutils default for max-page-size and
common-page-size used to produce this result. By setting these
values, we can nudge lld to also separate these sections into separate
2M pages.
Reviewed by: jhb, kib
Discussed with: emaste
Sponsored by: Netflix
Differential Revision: D14282
Modified:
head/sys/conf/kern.pre.mk
Modified: head/sys/conf/kern.pre.mk
==============================================================================
--- head/sys/conf/kern.pre.mk Tue Mar 6 12:58:00 2018 (r330537)
+++ head/sys/conf/kern.pre.mk Tue Mar 6 14:18:45 2018 (r330538)
@@ -120,6 +120,10 @@ CFLAGS+= ${CONF_CFLAGS}
LDFLAGS+= -Wl,--build-id=sha1
.endif
+.if ${MACHINE_CPUARCH} == "amd64"
+LDFLAGS+= -Wl,-z max-page-size=2097152 -Wl,-z common-page-size=4096
+.endif
+
NORMAL_C= ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}
NORMAL_S= ${CC:N${CCACHE_BIN}} -c ${ASM_CFLAGS} ${WERROR} ${.IMPSRC}
PROFILE_C= ${CC} -c ${CFLAGS} ${WERROR} ${.IMPSRC}
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