[merged mm-stable] mm-vmalloc-use-trace_purge_vmap_area_lazy-event.patch removed from -mm tree

[merged mm-stable] mm-vmalloc-use-trace_purge_vmap_area_lazy-event.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: vmalloc: use trace_purge_vmap_area_lazy event
has been removed from the -mm tree.  Its filename was
     mm-vmalloc-use-trace_purge_vmap_area_lazy-event.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Subject: mm: vmalloc: use trace_purge_vmap_area_lazy event
Date: Tue, 18 Oct 2022 20:10:51 +0200

This is for debug purposes and is called when all outstanding areas are
removed back to the vmap space.  It gives some extra information about:

- a start:end range where set of vmap ares were freed;
- a number of purged areas which were backed off.

[urezki@gmail.com: simplify return boolean expression]
  Link: https://lkml.kernel.org/r/20221020125247.5053-1-urezki@gmail.com
Link: https://lkml.kernel.org/r/20221018181053.434508-6-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmalloc.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/mm/vmalloc.c~mm-vmalloc-use-trace_purge_vmap_area_lazy-event
+++ a/mm/vmalloc.c
@@ -1730,6 +1730,7 @@ static void purge_fragmented_blocks_allc
 static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
 {
 	unsigned long resched_threshold;
+	unsigned int num_purged_areas = 0;
 	struct list_head local_purge_list;
 	struct vmap_area *va, *n_va;
 
@@ -1741,7 +1742,7 @@ static bool __purge_vmap_area_lazy(unsig
 	spin_unlock(&purge_vmap_area_lock);
 
 	if (unlikely(list_empty(&local_purge_list)))
-		return false;
+		goto out;
 
 	start = min(start,
 		list_first_entry(&local_purge_list,
@@ -1776,12 +1777,16 @@ static bool __purge_vmap_area_lazy(unsig
 					      va->va_start, va->va_end);
 
 		atomic_long_sub(nr, &vmap_lazy_nr);
+		num_purged_areas++;
 
 		if (atomic_long_read(&vmap_lazy_nr) < resched_threshold)
 			cond_resched_lock(&free_vmap_area_lock);
 	}
 	spin_unlock(&free_vmap_area_lock);
-	return true;
+
+out:
+	trace_purge_vmap_area_lazy(start, end, num_purged_areas);
+	return num_purged_areas > 0;
 }
 
 /*
_

Patches currently in -mm which might be from urezki@gmail.com are