Remove global memory variables

Platforms such as Illumos and FreeBSD have historically provided
global variables which summerize the memory state of a system.
Linux on the otherhand doesn't expose any of this information
to kernel modules and uses entirely different mechanisms for
memory management.

In order to simplify the original ZFS port to Linux these global
variables were emulated by the SPL for the benefit of ZFS.  As ZoL
has matured over the years it has moved steadily away from these
interfaces and now no longer depends on them at all.

Therefore, this patch completely removes the global variables
availrmem, minfree, desfree, lotsfree, needfree, swapfs_minfree,
and swapfs_reserve.  This greatly simplifies the memory management
code and eliminates a common area of confusion.

Signed-off-by: Brian Behlendorf <[email protected]>

1 files changed, 0 insertions, 119 deletions

diff --git a/module/spl/spl-proc.c b/module/spl/spl-proc.c
index 3daa3deea..9c42c96ea 100644
--- a/module/spl/spl-proc.c
+++ b/module/spl/spl-proc.c
@@ -454,55 +454,6 @@ SPL_PROC_HANDLER(proc_dokallsyms_lookup_name)
 }
 #endif /* HAVE_KALLSYMS_LOOKUP_NAME */
 
-SPL_PROC_HANDLER(proc_doavailrmem)
-{
-        int len, rc = 0;
-	char str[32];
-	SENTRY;
-
-        if (write) {
-                *ppos += *lenp;
-        } else {
-		len = snprintf(str, sizeof(str), "%lu",
-			       (unsigned long)availrmem);
-		if (*ppos >= len)
-			rc = 0;
-		else
-			rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
-
-		if (rc >= 0) {
-			*lenp = rc;
-			*ppos += rc;
-		}
-        }
-
-        SRETURN(rc);
-}
-
-SPL_PROC_HANDLER(proc_dofreemem)
-{
-        int len, rc = 0;
-	char str[32];
-	SENTRY;
-
-        if (write) {
-                *ppos += *lenp;
-        } else {
-		len = snprintf(str, sizeof(str), "%lu", (unsigned long)freemem);
-		if (*ppos >= len)
-			rc = 0;
-		else
-			rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
-
-		if (rc >= 0) {
-			*lenp = rc;
-			*ppos += rc;
-		}
-        }
-
-        SRETURN(rc);
-}
-
 #ifdef DEBUG_KMEM
 static void
 slab_seq_show_headers(struct seq_file *f)
@@ -719,71 +670,6 @@ static struct ctl_table spl_debug_table[] = {
 };
 #endif /* DEBUG_LOG */
 
-static struct ctl_table spl_vm_table[] = {
-        {
-                .procname = "minfree",
-                .data     = &minfree,
-                .maxlen   = sizeof(int),
-                .mode     = 0644,
-                .proc_handler = &proc_dointvec,
-        },
-        {
-                .procname = "desfree",
-                .data     = &desfree,
-                .maxlen   = sizeof(int),
-                .mode     = 0644,
-                .proc_handler = &proc_dointvec,
-        },
-        {
-                .procname = "lotsfree",
-                .data     = &lotsfree,
-                .maxlen   = sizeof(int),
-                .mode     = 0644,
-                .proc_handler = &proc_dointvec,
-        },
-        {
-                .procname = "needfree",
-                .data     = &needfree,
-                .maxlen   = sizeof(int),
-                .mode     = 0444,
-                .proc_handler = &proc_dointvec,
-        },
-        {
-                .procname = "swapfs_minfree",
-                .data     = &swapfs_minfree,
-                .maxlen   = sizeof(int),
-                .mode     = 0644,
-                .proc_handler = &proc_dointvec,
-        },
-        {
-                .procname = "swapfs_reserve",
-                .data     = &swapfs_reserve,
-                .maxlen   = sizeof(int),
-                .mode     = 0644,
-                .proc_handler = &proc_dointvec,
-        },
-        {
-                .procname = "availrmem",
-                .mode     = 0444,
-                .proc_handler = &proc_doavailrmem,
-        },
-        {
-                .procname = "freemem",
-                .data     = (void *)2,
-                .maxlen   = sizeof(int),
-                .mode     = 0444,
-                .proc_handler = &proc_dofreemem,
-        },
-        {
-                .procname = "physmem",
-                .data     = &physmem,
-                .maxlen   = sizeof(int),
-                .mode     = 0444,
-                .proc_handler = &proc_dointvec,
-        },
-	{0},
-};
-
 #ifdef DEBUG_KMEM
 static struct ctl_table spl_kmem_table[] = {
         {
@@ -922,11 +808,6 @@ static struct ctl_table spl_table[] = {
 		.child    = spl_debug_table,
 	},
 #endif
-	{
-		.procname = "vm",
-		.mode     = 0555,
-		.child    = spl_vm_table,
-	},
 #ifdef DEBUG_KMEM
 	{
 		.procname = "kmem",