The patch titled
Subject: mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9
has been removed from the -mm tree. Its filename was
mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9.patch
This patch was dropped because it was folded into mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed.patch
------------------------------------------------------
From: Andrew Shewmaker <agshew@xxxxxxxxx>
Subject: mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9
* Explanatory comments for magic numbers in memory notifier
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff -puN mm/mmap.c~mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9 mm/mmap.c
--- a/mm/mmap.c~mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9
+++ a/mm/mmap.c
@@ -3147,6 +3147,13 @@ module_init(init_admin_reserve)
/*
* Reinititalise user and admin reserves if memory is added or removed.
*
+ * The default user reserve max is 128MB, and the default max for the
+ * admin reserve is 8MB. These are usually, but not always, enough to
+ * enable recovery from a memory hogging process using login/sshd, a shell,
+ * and tools like top. It may make sense to increase or even disable the
+ * reserve depending on the existence of swap or variations in the recovery
+ * tools. So, the admin may have changed them.
+ *
* If memory is added and the reserves have been eliminated or increased above
* the default max, then we'll trust the admin.
*
@@ -3162,10 +3169,16 @@ static int reserve_mem_notifier(struct n
switch (action) {
case MEM_ONLINE:
+ /*
+ * Default max is 128MB. Leave alone if modified by operator.
+ */
tmp = sysctl_user_reserve_kbytes;
if (0 < tmp && tmp < (1UL << 17))
init_user_reserve();
+ /*
+ * Default max is 8MB. Leave alone if modified by operator.
+ */
tmp = sysctl_admin_reserve_kbytes;
if (0 < tmp && tmp < (1UL << 13))
init_admin_reserve();
_
Patches currently in -mm which might be from agshew@xxxxxxxxx are
include-linux-memoryh-implement-register_hotmemory_notifier.patch
mm-limit-growth-of-3%-hardcoded-other-user-reserve.patch
mm-replace-hardcoded-3%-with-admin_reserve_pages-knob.patch
mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed.patch
mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9-checkpatch-fixes.patch
mm-reinititalise-user-and-admin-reserves-if-memory-is-added-or-removed-v9-checkpatch-fixes-fix.patch
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