mirror of https://gitee.com/openkylin/linux.git
2a1dcb1f79
There are two different events being traced here. They are doing similar things so share a trace "EVENT_CLASS" and are presented together. 1. Trace when MPX is zapping pages "mpx_unmap_zap": When MPX can not free an entire bounds table, it will instead try to zap unused parts of a bounds table to free the backing memory. This decreases RSS (resident set size) without decreasing the virtual space allocated for bounds tables. 2. Trace attempts to find bounds tables "mpx_unmap_search": This event traces any time we go looking to unmap a bounds table for a given virtual address range. This is useful to ensure that the kernel actually "tried" to free a bounds table versus times it succeeded in finding one. It might try and fail if it realized that a table was shared with an adjacent VMA which is not being unmapped. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Hansen <dave@sr71.net> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20150607183703.B9D2468B@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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