Messages in this thread Patch in this message | | | From | "Uladzislau Rezki (Sony)" <> | Subject | [PATCH 5/7] mm/vmalloc: Use a trace_purge_vmap_area_lazy event | Date | Mon, 17 Oct 2022 18:02:31 +0200 |
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This is for debug purpose 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.
Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> --- mm/vmalloc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index f4397817ccd7..912abcd6e8b4 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1731,6 +1731,7 @@ 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; @@ -1742,7 +1743,7 @@ 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, @@ -1777,12 +1778,16 @@ 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 ? true:false; } /* -- 2.30.2
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