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authorUladzislau Rezki (Sony) <urezki@gmail.com>2022-10-18 21:10:51 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-11-09 04:37:17 +0300
commit6030fd5fd1f7baaac3661a5301cc7838d4e3b7f6 (patch)
tree9677859e46d2e4efe3487a5edfe7b7848bbcb797 /mm/vmalloc.c
parentcf243da6ab3987b65b95357194926a31415095b8 (diff)
downloadlinux-6030fd5fd1f7baaac3661a5301cc7838d4e3b7f6.tar.xz
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>
Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 849563d334fb..1b1205ade1cf 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -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;
}
/*