[PATCH 1/2] Add trace events to mmap and brk
in [Kernel]
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From: Eric B Munson on 9 Jul 2010 12:00 As requested by Peter Zijlstra, this patch builds on my earlier patch and adds the corresponding trace points to mmap and brk. Signed-off-by: Eric B Munson <emunson(a)mgebm.net> --- include/trace/events/mm.h | 38 ++++++++++++++++++++++++++++++++++++++ mm/mmap.c | 10 +++++++++- 2 files changed, 47 insertions(+), 1 deletions(-) diff --git a/include/trace/events/mm.h b/include/trace/events/mm.h index c3a3857..1563988 100644 --- a/include/trace/events/mm.h +++ b/include/trace/events/mm.h @@ -24,6 +24,44 @@ TRACE_EVENT(munmap, TP_printk("unmapping %u bytes at %lu\n", __entry->len, __entry->start) ); +TRACE_EVENT(brk, + TP_PROTO(unsigned long addr, unsigned long len), + + TP_ARGS(addr, len), + + TP_STRUCT__entry( + __field(unsigned long, addr) + __field(unsigned long, len) + ), + + TP_fast_assign( + __entry->addr = addr; + __entry->len = len; + ), + + TP_printk("brk mmapping %lu bytes at %lu\n", __entry->len, + __entry->addr) +); + +TRACE_EVENT(mmap, + TP_PROTO(unsigned long addr, unsigned long len), + + TP_ARGS(addr, len), + + TP_STRUCT__entry( + __field(unsigned long, addr) + __field(unsigned long, len) + ), + + TP_fast_assign( + __entry->addr = addr; + __entry->len = len; + ), + + TP_printk("mmapping %lu bytes at %lu\n", __entry->len, + __entry->addr) +); + #endif /* _TRACE_MM_H_ */ /* This part must be outside protection */ diff --git a/mm/mmap.c b/mm/mmap.c index 0775a30..252e3e0 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -952,6 +952,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned int vm_flags; int error; unsigned long reqprot = prot; + unsigned long ret; /* * Does the application expect PROT_READ to imply PROT_EXEC? @@ -1077,7 +1078,12 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, if (error) return error; - return mmap_region(file, addr, len, flags, vm_flags, pgoff); + ret = mmap_region(file, addr, len, flags, vm_flags, pgoff); + + if (!(ret & ~PAGE_MASK)) + trace_mmap(addr, len); + + return ret; } EXPORT_SYMBOL(do_mmap_pgoff); @@ -2218,6 +2224,8 @@ out: if (!mlock_vma_pages_range(vma, addr, addr + len)) mm->locked_vm += (len >> PAGE_SHIFT); } + + trace_brk(addr, len); return addr; } -- 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/ |