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mm: vmalloc: use trace_purge_vmap_area_lazy event 

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>
This commit is contained in:
Uladzislau Rezki (Sony) 2022-10-18 20:10:51 +02:00 committed by Andrew Morton
parent cf243da6ab
commit 6030fd5fd1
1 changed files with 7 additions and 2 deletions
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9
mm/vmalloc.c
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@ -1730,6 +1730,7 @@ static void purge_fragmented_blocks_allcpus(void);
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(unsigned long start, unsigned long end)
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(unsigned long start, unsigned long end)
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;
}
/*