Author: markj
Date: Wed Jun 10 23:52:39 2020
New Revision: 362036
URL: https://svnweb.freebsd.org/changeset/base/362036
Log:
Add a comment reflecting the commit log for r361945.
Suggested by: alc
Reviewed by: alc
MFC with: r361945
Modified:
head/sys/compat/linux/linux_misc.c
Modified: head/sys/compat/linux/linux_misc.c
==============================================================================
--- head/sys/compat/linux/linux_misc.c Wed Jun 10 23:52:29 2020
(r362035)
+++ head/sys/compat/linux/linux_misc.c Wed Jun 10 23:52:39 2020
(r362036)
@@ -167,6 +167,12 @@ linux_sysinfo(struct thread *td, struct linux_sysinfo_
sysinfo.totalram = physmem * PAGE_SIZE;
sysinfo.freeram = sysinfo.totalram - vm_wire_count() * PAGE_SIZE;
+ /*
+ * sharedram counts pages allocated to named, swap-backed objects such
+ * as shared memory segments and tmpfs files. There is no cheap way to
+ * compute this, so just leave the field unpopulated. Linux itself only
+ * started setting this field in the 3.x timeframe.
+ */
sysinfo.sharedram = 0;
sysinfo.bufferram = 0;
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