[PATCH 2/2] Add mremap trace point
in [Kernel]
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From: Eric B Munson on 19 Jul 2010 13:10 This patch adds the trace point for mremap which reports relevant addresses and sizes when mremap exits successfully. Signed-off-by: Eric B Munson <emunson(a)mgebm.net> --- include/trace/events/mm.h | 22 ++++++++++++++++++++++ mm/mremap.c | 4 ++++ 2 files changed, 26 insertions(+), 0 deletions(-) diff --git a/include/trace/events/mm.h b/include/trace/events/mm.h index 892bbe3..16f8c36 100644 --- a/include/trace/events/mm.h +++ b/include/trace/events/mm.h @@ -69,6 +69,28 @@ TRACE_EVENT( TP_printk("%u bytes at 0x%lx\n", __entry->len, __entry->start) ); +TRACE_EVENT( + mremap, + TP_PROTO(unsigned long addr, unsigned long old_len, + unsigned long new_addr, unsigned long new_len), + TP_ARGS(addr, old_len, new_addr, new_len), + TP_STRUCT__entry( + __field(unsigned long, addr) + __field(unsigned long, old_len) + __field(unsigned long, new_addr) + __field(unsigned long, new_len) + ), + TP_fast_assign( + __entry->addr = addr; + __entry->old_len = old_len; + __entry->new_addr = new_addr; + __entry->new_len = new_len; + ), + TP_printk("%lu bytes from 0x%lx to %lu bytes at 0x%lx\n", + __entry->old_len, __entry->addr, __entry->new_len, + __entry->new_addr) +); + #endif /* _TRACE_MM_H */ #include <trace/define_trace.h> diff --git a/mm/mremap.c b/mm/mremap.c index cde56ee..4ef1dd3 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -20,6 +20,8 @@ #include <linux/syscalls.h> #include <linux/mmu_notifier.h> +#include <trace/events/mm.h> + #include <asm/uaccess.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> @@ -504,6 +506,8 @@ unsigned long do_mremap(unsigned long addr, out: if (ret & ~PAGE_MASK) vm_unacct_memory(charged); + else + trace_mremap(addr, old_len, new_addr, new_len); return ret; } -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |