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Add basic getcpu(2) support to linuxulator. The purpose of this

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syscall is to query the CPU number and the NUMA domain the calling
thread is currently running on.  The third argument is ignored.
It doesn't do anything regarding scheduling - it's literally
just a way to query the current state, without any guarantees
you won't get rescheduled an opcode later.

This unbreaks Java from CentOS 8
(java-11-openjdk-11.0.5.10-0.el8_0.x86_64).

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22972
This commit is contained in:
Edward Tomasz Napierala 2019-12-31 22:01:08 +00:00
parent 8c3fbf3c20
commit cc50333011
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356241
5 changed files with 16 additions and 8 deletions
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2
sys/amd64/linux/linux_dummy.c
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@ -102,8 +102,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
/* Linux 2.6.19: */
DUMMY(getcpu);
/* Linux 2.6.22: */
DUMMY(signalfd);
/* Linux 2.6.27: */

2
sys/amd64/linux32/linux32_dummy.c
View File

@ -108,8 +108,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
/* Linux 2.6.19: */
DUMMY(getcpu);
/* Linux 2.6.22: */
DUMMY(signalfd);
/* Linux 2.6.27: */

2
sys/arm64/linux/linux_dummy.c
View File

@ -104,8 +104,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
/* Linux 2.6.19: */
DUMMY(getcpu);
/* Linux 2.6.27: */
DUMMY(signalfd4);
DUMMY(inotify_init1);

16
sys/compat/linux/linux_misc.c
View File

@ -2353,3 +2353,19 @@ linux_syslog(struct thread *td, struct linux_syslog_args *args)
td->td_retval[0] = dst - args->buf;
return (error);
}
int
linux_getcpu(struct thread *td, struct linux_getcpu_args *args)
{
int cpu, error, node;
cpu = td->td_oncpu; /* Make sure it doesn't change during copyout(9) */
error = 0;
node = 0; /* XXX: Fake NUMA node 0 for now */
if (args->cpu != NULL)
error = copyout(&cpu, args->cpu, sizeof(l_int));
if (args->node != NULL)
error = copyout(&node, args->node, sizeof(l_int));
return (error);
}

2
sys/i386/linux/linux_dummy.c
View File

@ -104,8 +104,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
/* Linux 2.6.19: */
DUMMY(getcpu);
/* Linux 2.6.22: */
DUMMY(signalfd);
/* Linux 2.6.27: */