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@xxxxxxxxx>
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@xxxxxxxxx: simplify return boolean expression]
Link: https://lkml.kernel.org/r/20221020125247.5053-1-urezki@xxxxxxxxx
Link: https://lkml.kernel.org/r/20221018181053.434508-6-urezki@xxxxxxxxx
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx are
