From b3a5a7b099162e1b11db459f8128d4374f7d1c05 Mon Sep 17 00:00:00 2001 From: "Uladzislau Rezki (Sony)" Date: Tue, 18 Oct 2022 20:10:48 +0200 Subject: [PATCH] mm: vmalloc: add purge_vmap_area_lazy trace event It is for debug purposes to track number of freed vmap areas including a range it occurs on. Link: https://lkml.kernel.org/r/20221018181053.434508-3-urezki@gmail.com Signed-off-by: Uladzislau Rezki (Sony) Reviewed-by: Steven Rostedt (Google) Reviewed-by: Christoph Hellwig Cc: Matthew Wilcox (Oracle) Cc: Nicholas Piggin Cc: Oleksiy Avramchenko Signed-off-by: Andrew Morton --- include/trace/events/vmalloc.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/include/trace/events/vmalloc.h b/include/trace/events/vmalloc.h index 39fbd77c91e7..afeb8003a0f2 100644 --- a/include/trace/events/vmalloc.h +++ b/include/trace/events/vmalloc.h @@ -50,6 +50,39 @@ TRACE_EVENT(alloc_vmap_area, __entry->vstart, __entry->vend, __entry->failed) ); +/** + * purge_vmap_area_lazy - called when vmap areas were lazily freed + * @start: purging start address + * @end: purging end address + * @npurged: numbed of purged vmap areas + * + * This event is used for a debug purpose. It gives some + * indication about start:end range and how many objects + * are released. + */ +TRACE_EVENT(purge_vmap_area_lazy, + + TP_PROTO(unsigned long start, unsigned long end, + unsigned int npurged), + + TP_ARGS(start, end, npurged), + + TP_STRUCT__entry( + __field(unsigned long, start) + __field(unsigned long, end) + __field(unsigned int, npurged) + ), + + TP_fast_assign( + __entry->start = start; + __entry->end = end; + __entry->npurged = npurged; + ), + + TP_printk("start=0x%lx end=0x%lx num_purged=%u", + __entry->start, __entry->end, __entry->npurged) +); + #endif /* _TRACE_VMALLOC_H */ /* This part must be outside protection */