mm/vmalloc: add more comments to the adjust_va_to_fit_type()

When fit type is NE_FIT_TYPE there is a need in one extra object.
Usually the "ne_fit_preload_node" per-CPU variable has it and there is
no need in GFP_NOWAIT allocation, but there are exceptions.

This commit just adds more explanations, as a result giving answers on
questions like when it can occur, how often, under which conditions and
what happens if GFP_NOWAIT gets failed.

Link: http://lkml.kernel.org/r/20191016095438.12391-3-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b3bb50d..9bb6610 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -968,6 +968,19 @@ adjust_va_to_fit_type(struct vmap_area *va,
                         * There are a few exceptions though, as an example it is
                         * a first allocation (early boot up) when we have "one"
                         * big free space that has to be split.
+                        *
+                        * Also we can hit this path in case of regular "vmap"
+                        * allocations, if "this" current CPU was not preloaded.
+                        * See the comment in alloc_vmap_area() why. If so, then
+                        * GFP_NOWAIT is used instead to get an extra object for
+                        * split purpose. That is rare and most time does not
+                        * occur.
+                        *
+                        * What happens if an allocation gets failed. Basically,
+                        * an "overflow" path is triggered to purge lazily freed
+                        * areas to free some memory, then, the "retry" path is
+                        * triggered to repeat one more time. See more details
+                        * in alloc_vmap_area() function.
                         */
                        lva = kmem_cache_alloc(vmap_area_cachep, GFP_NOWAIT);
                        if (!lva)