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From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Tue, 7 Feb 2017 17:03:23 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r313391 - head/sys/kern
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Author: mjg
Date: Tue Feb 7 17:03:22 2017
New Revision: 313391
URL: https://svnweb.freebsd.org/changeset/base/313391
Log:
Bump struct thread alignment to 32.
This gives additional bits to use in locking primitives which store
the lock thread pointer in the lock value.
Discussed with: kib
Modified:
head/sys/kern/init_main.c
head/sys/kern/kern_thread.c
Modified: head/sys/kern/init_main.c
==============================================================================
--- head/sys/kern/init_main.c Tue Feb 7 16:01:07 2017 (r313390)
+++ head/sys/kern/init_main.c Tue Feb 7 17:03:22 2017 (r313391)
@@ -99,7 +99,7 @@ void mi_startup(void); /* Should be e
static struct session session0;
static struct pgrp pgrp0;
struct proc proc0;
-struct thread0_storage thread0_st __aligned(16);
+struct thread0_storage thread0_st __aligned(32);
struct vmspace vmspace0;
struct proc *initproc;
Modified: head/sys/kern/kern_thread.c
==============================================================================
--- head/sys/kern/kern_thread.c Tue Feb 7 16:01:07 2017 (r313390)
+++ head/sys/kern/kern_thread.c Tue Feb 7 17:03:22 2017 (r313391)
@@ -281,7 +281,7 @@ threadinit(void)
thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(),
thread_ctor, thread_dtor, thread_init, thread_fini,
- 16 - 1, UMA_ZONE_NOFREE);
+ 32 - 1, UMA_ZONE_NOFREE);
tidhashtbl = hashinit(maxproc / 2, M_TIDHASH, &tidhash);
rw_init(&tidhash_lock, "tidhash");
}