lkml.org 
[lkml]   [2015]   [May]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH 11/19] x86, mpx: trace allocation of new bounds tables
    From
    Date

    From: Dave Hansen <dave.hansen@linux.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@linux.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 2015-05-08 11:46:15.388779997 -0700
    +++ b/arch/x86/include/asm/trace/mpx.h 2015-05-08 11:46:15.393780223 -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 2015-05-08 11:46:15.390780087 -0700
    +++ b/arch/x86/mm/mpx.c 2015-05-08 11:46:15.394780268 -0700
    @@ -483,6 +483,7 @@ 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);
    _

    \
     
     \ /
      Last update: 2015-05-08 21:21    [W:3.863 / U:0.332 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site