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mm: vmalloc: use trace_free_vmap_area_noflush event

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It is for debug purposes and is called when a vmap area gets freed.  This
event gives some indication about:

- a start address of released area;
- a current number of outstanding pages;
- a maximum number of allowed outstanding pages.

Link: https://lkml.kernel.org/r/20221018181053.434508-7-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>
This commit is contained in:
Uladzislau Rezki (Sony) 2022-10-18 20:10:52 +02:00 committed by Andrew Morton
parent 6030fd5fd1
commit 8c4196fe81
1 changed files with 5 additions and 1 deletions
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6
mm/vmalloc.c
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@ -1821,6 +1821,8 @@ static void drain_vmap_area_work(struct work_struct *work)
*/
static void free_vmap_area_noflush(struct vmap_area *va)
{
unsigned long nr_lazy_max = lazy_max_pages();
unsigned long va_start = va->va_start;
unsigned long nr_lazy;
spin_lock(&vmap_area_lock);
@ -1838,8 +1840,10 @@ static void free_vmap_area_noflush(struct vmap_area *va)
&purge_vmap_area_root, &purge_vmap_area_list);
spin_unlock(&purge_vmap_area_lock);
trace_free_vmap_area_noflush(va_start, nr_lazy, nr_lazy_max);
/* After this point, we may free va at any time */
if (unlikely(nr_lazy > lazy_max_pages()))
if (unlikely(nr_lazy > nr_lazy_max))
schedule_work(&drain_vmap_work);
}