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Date: Tue, 31 Mar 2015 17:46:31 -0700 From: Dave Hansen <dave@...1.net> To: linux-kernel@...r.kernel.org Cc: x86@...nel.org, tglx@...utronix.de, Dave Hansen <dave@...1.net>, dave.hansen@...ux.intel.com Subject: [PATCH 06/16] x86, mpx: trace allocation of new bounds tables From: Dave Hansen <dave.hansen@...ux.intel.com> Bounds tables are a significant consumer of memory. It is important to know when they are being allocated. Add a trace point to trace whenever an allocation occurs and also its virtual address. Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> --- b/arch/x86/include/asm/trace/mpx.h | 16 ++++++++++++++++ b/arch/x86/mm/mpx.c | 1 + 2 files changed, 17 insertions(+) diff -puN arch/x86/include/asm/trace/mpx.h~trace_mpx_new_bounds_table arch/x86/include/asm/trace/mpx.h --- a/arch/x86/include/asm/trace/mpx.h~trace_mpx_new_bounds_table 2015-03-31 16:41:57.623342307 -0700 +++ b/arch/x86/include/asm/trace/mpx.h 2015-03-31 16:41:57.627342488 -0700 @@ -85,6 +85,22 @@ DEFINE_EVENT(mpx_range_trace, mpx_unmap_ TP_ARGS(start, end) ); +TRACE_EVENT(mpx_new_bounds_table, + + TP_PROTO(unsigned long table_vaddr), + TP_ARGS(table_vaddr), + + TP_STRUCT__entry( + __field(unsigned long, table_vaddr) + ), + + TP_fast_assign( + __entry->table_vaddr = table_vaddr; + ), + + TP_printk("table vaddr:%p", (void *)__entry->table_vaddr) +); + #else /* diff -puN arch/x86/mm/mpx.c~trace_mpx_new_bounds_table arch/x86/mm/mpx.c --- a/arch/x86/mm/mpx.c~trace_mpx_new_bounds_table 2015-03-31 16:41:57.624342353 -0700 +++ b/arch/x86/mm/mpx.c 2015-03-31 16:41:57.628342533 -0700 @@ -485,6 +485,7 @@ static int allocate_bt(long __user *bd_e ret = -EINVAL; goto out_unmap; } + trace_mpx_new_bounds_table(bt_addr); return 0; out_unmap: vm_munmap(bt_addr & MPX_BT_ADDR_MASK, MPX_BT_SIZE_BYTES); _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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