Christoph Lameter wrote:
/*
+ * Notifier for devices establishing their own references to Linux
+ * kernel pages in addition to the regular mapping via page
+ * table and rmap. The notifier allows the device to drop the mapping
+ * when the VM removes references to pages.
+ */
+enum emm_operation {
+ emm_release, /* Process existing, */
+ emm_invalidate_start, /* Before the VM unmaps pages */
+ emm_invalidate_end, /* After the VM unmapped pages */
+ emm_referenced /* Check if a range was referenced */
+};
Check and clear
btw, a similar test and clear dirty would be useful as well, no?
+
+struct emm_notifier {
+ int (*callback)(struct emm_notifier *e, struct mm_struct *mm,
+ enum emm_operation op,
+ unsigned long start, unsigned long end);
+ struct emm_notifier *next;
+};
+
It is cleaner for the user to specify individual callbacks instead of
having a switch.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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