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powerpc/mm: Add trace point for tracking hash pte fault
This enables us to understand how many hash fault we are taking when running benchmarks. For ex: -bash-4.2# ./perf stat -e powerpc:hash_fault -e page-faults /tmp/ebizzy.ppc64 -S 30 -P -n 1000 ... Performance counter stats for '/tmp/ebizzy.ppc64 -S 30 -P -n 1000': 1,10,04,075 powerpc:hash_fault 1,10,03,429 page-faults 30.865978991 seconds time elapsed NOTE: The impact of the tracepoint was not noticeable when running test. It was within the run-time variance of the test. For ex: without-patch: -------------- Performance counter stats for './a.out 3000 300': 643 page-faults # 0.089 M/sec 7.236562 task-clock (msec) # 0.928 CPUs utilized 2,179,213 stalled-cycles-frontend # 0.00% frontend cycles idle 17,174,367 stalled-cycles-backend # 0.00% backend cycles idle 0 context-switches # 0.000 K/sec 0.007794658 seconds time elapsed And with-patch: --------------- Performance counter stats for './a.out 3000 300': 643 page-faults # 0.089 M/sec 7.233746 task-clock (msec) # 0.921 CPUs utilized 0 context-switches # 0.000 K/sec 0.007854876 seconds time elapsed Performance counter stats for './a.out 3000 300': 643 page-faults # 0.087 M/sec 649 powerpc:hash_fault # 0.087 M/sec 7.430376 task-clock (msec) # 0.938 CPUs utilized 2,347,174 stalled-cycles-frontend # 0.00% frontend cycles idle 17,524,282 stalled-cycles-backend # 0.00% backend cycles idle 0 context-switches # 0.000 K/sec 0.007920284 seconds time elapsed Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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2 changed files with 22 additions and 0 deletions
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@ -144,6 +144,26 @@ TRACE_EVENT_FN(opal_exit,
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);
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);
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#endif
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#endif
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TRACE_EVENT(hash_fault,
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TP_PROTO(unsigned long addr, unsigned long access, unsigned long trap),
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TP_ARGS(addr, access, trap),
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TP_STRUCT__entry(
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__field(unsigned long, addr)
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__field(unsigned long, access)
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__field(unsigned long, trap)
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),
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TP_fast_assign(
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__entry->addr = addr;
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__entry->access = access;
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__entry->trap = trap;
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),
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TP_printk("hash fault with addr 0x%lx and access = 0x%lx trap = 0x%lx",
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__entry->addr, __entry->access, __entry->trap)
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);
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#endif /* _TRACE_POWERPC_H */
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#endif /* _TRACE_POWERPC_H */
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#undef TRACE_INCLUDE_PATH
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#undef TRACE_INCLUDE_PATH
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@ -57,6 +57,7 @@
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#include <asm/fadump.h>
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#include <asm/fadump.h>
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#include <asm/firmware.h>
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#include <asm/firmware.h>
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#include <asm/tm.h>
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#include <asm/tm.h>
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#include <asm/trace.h>
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#ifdef DEBUG
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#define DBG(fmt...) udbg_printf(fmt)
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@ -1004,6 +1005,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea,
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DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
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DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
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ea, access, trap);
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ea, access, trap);
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trace_hash_fault(ea, access, trap);
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/* Get region & vsid */
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/* Get region & vsid */
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switch (REGION_ID(ea)) {
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switch (REGION_ID(ea)) {
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