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| author | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2022-10-18 20:10:51 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-09 02:37:17 +0100 |
| commit | 6030fd5fd1f7baaac3661a5301cc7838d4e3b7f6 (patch) | |
| tree | 9677859e46d2e4efe3487a5edfe7b7848bbcb797 /mm | |
| parent | mm: vmalloc: use trace_alloc_vmap_area event (diff) | |
| download | linux-6030fd5fd1f7baaac3661a5301cc7838d4e3b7f6.tar.xz linux-6030fd5fd1f7baaac3661a5301cc7838d4e3b7f6.zip | |
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 '')
| -rw-r--r-- | mm/vmalloc.c | 9 |
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; } /* |