Jason Lowe-Power has submitted this change and it was merged. (
https://gem5-review.googlesource.com/8902 )
Change subject: sim-se: Add /sys/devices/system/cpu/online file
......................................................................
sim-se: Add /sys/devices/system/cpu/online file
Add the special file /sys/devices/system/cpu/online to the files that gem5
knows how to handle in SE mode. This file lists the CPUs that are active.
For instance, in an 8 CPU system it is the following:
0-7
This implementation simply returns a file that is 0-%d where %d is the
current number of thread contexts.
This file is required for C++11 threads with gcc 4.8 and above.
Change-Id: I0b566f77e75e9eca480509814d0fd038a231b940
Signed-off-by: Jason Lowe-Power <ja...@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/8902
Reviewed-by: Gabe Black <gabebl...@google.com>
Reviewed-by: Brandon Potter <brandon.pot...@amd.com>
Maintainer: Brandon Potter <brandon.pot...@amd.com>
---
M src/kern/linux/linux.cc
M src/kern/linux/linux.hh
2 files changed, 11 insertions(+), 0 deletions(-)
Approvals:
Brandon Potter: Looks good to me, approved; Looks good to me, approved
Gabe Black: Looks good to me, but someone else must approve
diff --git a/src/kern/linux/linux.cc b/src/kern/linux/linux.cc
index bd0b4d0..d571b81 100644
--- a/src/kern/linux/linux.cc
+++ b/src/kern/linux/linux.cc
@@ -55,6 +55,9 @@
} else if (path.compare(0, 11, "/etc/passwd") == 0) {
data = Linux::etcPasswd(process, tc);
matched = true;
+ } else if (path.compare(0, 30, "/sys/devices/system/cpu/online") == 0)
{
+ data = Linux::cpuOnline(process, tc);
+ matched = true;
}
if (matched) {
@@ -87,3 +90,10 @@
return csprintf("gem5-user:x:1000:1000:gem5-user,,,:%s:/bin/bash\n",
process->getcwd());
}
+
+std::string
+Linux::cpuOnline(Process *process, ThreadContext *tc)
+{
+ return csprintf("0-%d\n",
+ tc->getSystemPtr()->numContexts() - 1);
+}
diff --git a/src/kern/linux/linux.hh b/src/kern/linux/linux.hh
index b24ee38..a1df994 100644
--- a/src/kern/linux/linux.hh
+++ b/src/kern/linux/linux.hh
@@ -227,6 +227,7 @@
ThreadContext *tc);
static std::string procMeminfo(Process *process, ThreadContext *tc);
static std::string etcPasswd(Process *process, ThreadContext *tc);
+ static std::string cpuOnline(Process *process, ThreadContext *tc);
// For futex system call
static const unsigned TGT_FUTEX_WAIT = 0;
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: I0b566f77e75e9eca480509814d0fd038a231b940
Gerrit-Change-Number: 8902
Gerrit-PatchSet: 2
Gerrit-Owner: Jason Lowe-Power <ja...@lowepower.com>
Gerrit-Reviewer: Brandon Potter <brandon.pot...@amd.com>
Gerrit-Reviewer: Gabe Black <gabebl...@google.com>
Gerrit-Reviewer: Jason Lowe-Power <ja...@lowepower.com>
Gerrit-MessageType: merged
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