Commit fabc27f7 authored by Uladzislau Rezki (Sony)'s avatar Uladzislau Rezki (Sony) Committed by Andrew Morton
Browse files

mm: vmalloc: add free_vmap_area_noflush trace event 

This event is used in order to validate/debug a start address of freed VA,
number of currently outstanding and maximum allowed areas.

Link: https://lkml.kernel.org/r/20221018181053.434508-4-urezki@gmail.com


Signed-off-by: default avatarUladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: default avatarChristoph 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b3a5a7b0

include/trace/events/vmalloc.h

+34 −0
Original line number Diff line number Diff line
@@ -83,6 +83,40 @@ TRACE_EVENT(purge_vmap_area_lazy, 
		__entry->start, __entry->end, __entry->npurged)

);



/**

 * free_vmap_area_noflush - called when a vmap area is freed

 * @va_start:		a start address of VA

 * @nr_lazy:		number of current lazy pages

 * @nr_lazy_max:	number of maximum lazy pages

 *

 * This event is used for a debug purpose. It gives some

 * indication about a VA that is released, number of current

 * outstanding areas and a maximum allowed threshold before

 * dropping all of them.

 */

TRACE_EVENT(free_vmap_area_noflush,



	TP_PROTO(unsigned long va_start, unsigned long nr_lazy,

		unsigned long nr_lazy_max),



	TP_ARGS(va_start, nr_lazy, nr_lazy_max),



	TP_STRUCT__entry(

		__field(unsigned long, va_start)

		__field(unsigned long, nr_lazy)

		__field(unsigned long, nr_lazy_max)

	),



	TP_fast_assign(

		__entry->va_start = va_start;

		__entry->nr_lazy = nr_lazy;

		__entry->nr_lazy_max = nr_lazy_max;

	),



	TP_printk("va_start=0x%lx nr_lazy=%lu nr_lazy_max=%lu",

		__entry->va_start, __entry->nr_lazy, __entry->nr_lazy_max)

);



#endif /*  _TRACE_VMALLOC_H */



/* This part must be outside protection */