Attachment 187197 Details for Bug 223015 – vfs.tmpfs.inactive_percent sysctl

[patch] vfs.tmpfs.inactive_percent sysctl

tmpfs.diff (text/plain), 1.64 KB, created by Keith White on 2017-10-15 16:21:01 UTC

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Creator: Keith White

Created: 2017-10-15 16:21:01 UTC

Size: 1.64 KB

patch

obsolete

>Index: /usr/src/sys/fs/tmpfs/tmpfs_subr.c
>===================================================================
>--- /usr/src/sys/fs/tmpfs/tmpfs_subr.c	(revision 324624)
>+++ /usr/src/sys/fs/tmpfs/tmpfs_subr.c	(working copy)
>@@ -65,6 +65,7 @@
> SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system");
> 
> static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;
>+static int tmpfs_inactive_percent = 0;
> 
> static int
> sysctl_mem_reserved(SYSCTL_HANDLER_ARGS)
>@@ -87,9 +88,30 @@
> 	return (0);
> }
> 
>+static int
>+sysctl_inactive_percent(SYSCTL_HANDLER_ARGS)
>+{
>+	int error;
>+	int percent;
>+
>+	percent = *(int *)arg1;
>+	error = sysctl_handle_int(oidp, &percent, 0, req);
>+	if (error || !req->newptr)
>+		return (error);
>+	if (percent < 0)
>+		percent = 0;
>+	if (percent > 100)
>+		percent = 100;
>+	*(int *)arg1 = percent;
>+	return (0);
>+}
>+
> SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW,
>     &tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L",
>     "Amount of available memory and swap below which tmpfs growth stops");
>+SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, inactive_percent, CTLTYPE_INT|CTLFLAG_RW,
>+    &tmpfs_inactive_percent, 0, sysctl_inactive_percent, "I",
>+    "Percentage of inactive memory to add to free space");
> 
> static __inline int tmpfs_dirtree_cmp(struct tmpfs_dirent *a,
>     struct tmpfs_dirent *b);
>@@ -100,7 +122,9 @@
> {
> 	vm_ooffset_t avail;
> 
>-	avail = swap_pager_avail + vm_cnt.v_free_count - tmpfs_pages_reserved;
>+	avail = swap_pager_avail + vm_cnt.v_free_count +
>+		(vm_cnt.v_inactive_count / 100 * tmpfs_inactive_percent) -
>+		tmpfs_pages_reserved;
> 	if (__predict_false(avail < 0))
> 		avail = 0;
> 	return (avail);

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Attachments on bug 223015: 187197 | 187384