From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathieu Desnoyers Subject: Re: Addition of the return address to liblttng-ust-libc-wrapper Date: Fri, 16 Jan 2015 20:13:42 +0000 (UTC) Message-ID: <1127206322.43789.1421439222351.JavaMail.zimbra__46749.0657618784$1421439270$gmane$org@efficios.com> References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1006597482==" Return-path: Received: from mail.efficios.com ([78.47.125.74]) by ltt.polymtl.ca with esmtp (Exim 4.80) (envelope-from ) id 1YCDH5-0000ug-8x for lttng-dev@lists.lttng.org; Fri, 16 Jan 2015 15:13:45 -0500 In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: lttng-dev-bounces@lists.lttng.org To: Olivier Delbeke Cc: lttng-dev@lists.lttng.org List-Id: lttng-dev@lists.lttng.org --===============1006597482== Content-Type: multipart/alternative; boundary="----=_Part_43783_1152637141.1421439222348" ------=_Part_43783_1152637141.1421439222348 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable ----- Original Message ----- > From: "Olivier Delbeke" > To: lttng-dev@lists.lttng.org > Sent: Tuesday, January 13, 2015 10:50:38 AM > Subject: [lttng-dev] Addition of the return address to > liblttng-ust-libc-wrapper > Hi guys, > I am using liblttng-ust-libc-wrapper to detect memory leaks in my > applications. > In order to identify not only the thread where the unfreed allocations ar= e > done, but also the calling function, I extended the > liblttng-ust-libc-wrapper to log the "return address" > (__builtin_return_address(0)) in addition to the parameters of malloc(). = It > solves my problem and does not affect Trace Compass. > Was this the right thing to do ? You should be able to achieve the same thing with the "ip" context, e.g.:= =20 lttng create=20 lttng enable-event -u -a=20 lttng add-context -u -t ip=20 lttng start=20 ....=20 All this dynamically without changing the instrumentation.=20 Thanks,=20 Mathieu=20 > If it is, then I guess that it might interest other people too. > diff -Nurd b/liblttng-ust-libc-wrapper/lttng-ust-malloc.c > c/liblttng-ust-libc-wrapper/lttng-ust-malloc.c > --- b/liblttng-ust-libc-wrapper/lttng-ust-malloc.c 2015-01-06 > 17:14:34.000000000 +0100 > +++ c/liblttng-ust-libc-wrapper/lttng-ust-malloc.c 2015-01-06 > 17:16:40.811145106 +0100 > @@ -260,7 +260,7 @@ > } > retval =3D cur_alloc.malloc(size); > if (URCU_TLS(malloc_nesting) =3D=3D 1) { > - tracepoint(ust_libc, malloc, size, retval); > + tracepoint(ust_libc, malloc, size, retval, __builtin_return_address(0) = ); > } > URCU_TLS(malloc_nesting)--; > return retval; > @@ -279,7 +279,7 @@ > } > if (URCU_TLS(malloc_nesting) =3D=3D 1) { > - tracepoint(ust_libc, free, ptr); > + tracepoint(ust_libc, free, ptr, __builtin_return_address(0) ); > } > if (cur_alloc.free =3D=3D NULL) { > @@ -308,7 +308,7 @@ > } > retval =3D cur_alloc.calloc(nmemb, size); > if (URCU_TLS(malloc_nesting) =3D=3D 1) { > - tracepoint(ust_libc, calloc, nmemb, size, retval); > + tracepoint(ust_libc, calloc, nmemb, size, retval, > __builtin_return_address(0) ); > } > URCU_TLS(malloc_nesting)--; > return retval; > @@ -360,7 +360,7 @@ > retval =3D cur_alloc.realloc(ptr, size); > end: > if (URCU_TLS(malloc_nesting) =3D=3D 1) { > - tracepoint(ust_libc, realloc, ptr, size, retval); > + tracepoint(ust_libc, realloc, ptr, size, retval, > __builtin_return_address(0) ); > } > URCU_TLS(malloc_nesting)--; > return retval; > @@ -380,7 +380,7 @@ > } > retval =3D cur_alloc.memalign(alignment, size); > if (URCU_TLS(malloc_nesting) =3D=3D 1) { > - tracepoint(ust_libc, memalign, alignment, size, retval); > + tracepoint(ust_libc, memalign, alignment, size, retval, > __builtin_return_address(0) ); > } > URCU_TLS(malloc_nesting)--; > return retval; > @@ -401,7 +401,7 @@ > retval =3D cur_alloc.posix_memalign(memptr, alignment, size); > if (URCU_TLS(malloc_nesting) =3D=3D 1) { > tracepoint(ust_libc, posix_memalign, *memptr, alignment, size, > - retval); > + retval, __builtin_return_address(0) ); > } > URCU_TLS(malloc_nesting)--; > return retval; > diff -Nurd b/liblttng-ust-libc-wrapper/ust_libc.h > c/liblttng-ust-libc-wrapper/ust_libc.h > --- b/liblttng-ust-libc-wrapper/ust_libc.h 2015-01-06 17:14:34.000000000 > +0100 > +++ c/liblttng-ust-libc-wrapper/ust_libc.h 2015-01-06 17:16:40.811145106 > +0100 > @@ -33,54 +33,60 @@ > #include > TRACEPOINT_EVENT(ust_libc, malloc, > - TP_ARGS(size_t, size, void *, ptr), > + TP_ARGS(size_t, size, void *, ptr, void *, ra), > TP_FIELDS( > ctf_integer(size_t, size, size) > ctf_integer_hex(void *, ptr, ptr) > + ctf_integer_hex(void *, ra, ra) > ) > ) > TRACEPOINT_EVENT(ust_libc, free, > - TP_ARGS(void *, ptr), > + TP_ARGS(void *, ptr, void *, ra), > TP_FIELDS( > ctf_integer_hex(void *, ptr, ptr) > + ctf_integer_hex(void *, ra, ra) > ) > ) > TRACEPOINT_EVENT(ust_libc, calloc, > - TP_ARGS(size_t, nmemb, size_t, size, void *, ptr), > + TP_ARGS(size_t, nmemb, size_t, size, void *, ptr, void *, ra), > TP_FIELDS( > ctf_integer(size_t, nmemb, nmemb) > ctf_integer(size_t, size, size) > ctf_integer_hex(void *, ptr, ptr) > + ctf_integer_hex(void *, ra, ra) > ) > ) > TRACEPOINT_EVENT(ust_libc, realloc, > - TP_ARGS(void *, in_ptr, size_t, size, void *, ptr), > + TP_ARGS(void *, in_ptr, size_t, size, void *, ptr, void *, ra), > TP_FIELDS( > ctf_integer_hex(void *, in_ptr, in_ptr) > ctf_integer(size_t, size, size) > ctf_integer_hex(void *, ptr, ptr) > + ctf_integer_hex(void *, ra, ra) > ) > ) > TRACEPOINT_EVENT(ust_libc, memalign, > - TP_ARGS(size_t, alignment, size_t, size, void *, ptr), > + TP_ARGS(size_t, alignment, size_t, size, void *, ptr, void *, ra), > TP_FIELDS( > ctf_integer(size_t, alignment, alignment) > ctf_integer(size_t, size, size) > ctf_integer_hex(void *, ptr, ptr) > + ctf_integer_hex(void *, ra, ra) > ) > ) > TRACEPOINT_EVENT(ust_libc, posix_memalign, > - TP_ARGS(void *, out_ptr, size_t, alignment, size_t, size, int, result), > + TP_ARGS(void *, out_ptr, size_t, alignment, size_t, size, int, result, = void > *, ra), > TP_FIELDS( > ctf_integer_hex(void *, out_ptr, out_ptr) > ctf_integer(size_t, alignment, alignment) > ctf_integer(size_t, size, size) > ctf_integer(int, result, result) > + ctf_integer_hex(void *, ra, ra) > ) > ) > Best regards, >=20 > Olivier Delbeke Senior Software Engineer > Olivier.Delbeke@awtce.be / T. +32 2 389 25 53 > AWTC Europe S.A. - Avenue de l=E2=80=99Industrie, 19 - 1420 Braine-l=E2= =80=99Alleud - Belgium > - www.aweurope.eu - www.aisin-aw.co.jp > VAT : BE 0474.474.114 - RPM Nivelles > This mail, and any attachments thereto, is intended only for use by the > addressee(s) named herein and may contain legally privileged and/or > confidential information. If you are not the intended recipient, please n= ote > that any review, dissemination, disclosure, alteration, printing, copying= or > transmission of this mail and/or any file transmitted with it, is strictl= y > prohibited and may be unlawful. If you have received this mail by mistake= , > please immediately notify the sender as well as our mail administrator at > postmaster@aweurope.be, and permanently destroy the original as well as a= ny > copy thereof. > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev --=20 Mathieu Desnoyers=20 EfficiOS Inc.=20 http://www.efficios.com=20 ------=_Part_43783_1152637141.1421439222348 Content-Type: multipart/related; boundary="----=_Part_43784_2069932847.1421439222348" ------=_Part_43784_2069932847.1421439222348 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
From: "Olivier Delbeke" <Oli= vier.Delbeke@awtce.be>
To: lttng-dev@lists.lttng.org
Sen= t: Tuesday, January 13, 2015 10:50:38 AM
Subject: [lttng-dev]= Addition of the return address to       = ; liblttng-ust-libc-wrapper

Hi guys,
=


I am using liblttng-ust-libc-wrapper to detect memo= ry leaks in my applications.
In order to identify not only the= thread where the unfreed allocations are done, but also the calling functi= on, I extended the liblttng-ust-libc-wrapper to log the "return address" (_= _builtin_return_address(0)) in addition to the parameters of malloc(). It s= olves my problem and does not affect Trace Compass.
Was this = the right thing to do ?


You sho= uld be able to achieve the same thing with the "ip" context, e.g.:

lttng create
lttng enable-event -u -a
lttng add-context -u -t ip
lttng start
<= div>....

All this dynamically without changing= the instrumentation.

Thanks,
Mathieu

If it is, then I guess that it might intere= st other people too.


diff -Nurd b/liblttn= g-ust-libc-wrapper/lttng-ust-malloc.c c/liblttng-ust-libc-wrapper/lttng-ust= -malloc.c
--- b/liblttng-ust-libc-wrapper/lttng-ust-malloc.c 20= 15-01-06 17:14:34.000000000 +0100
+++ c/liblttng-ust-libc-wrapp= er/lttng-ust-malloc.c 2015-01-06 17:16:40.811145106 +0100
@@ -2= 60,7 +260,7 @@
  }
  retval =3D cur_alloc= .malloc(size);
  if (URCU_TLS(malloc_nesting) =3D=3D 1) {<= /span>
- tracepoint(ust_libc, malloc, size, retval);
+ tra= cepoint(ust_libc, malloc, size, retval, __builtin_return_address(0) );
  }
  URCU_TLS(malloc_nesting)--;
<= span style=3D"font-family: sans-serif; font-size: small;" data-mce-style=3D= "font-family: sans-serif; font-size: small;" face=3D"sans-serif" size=3D"2"= >  return retval;
@@ -279,7 +279,7 @@
  }=
 
  if (URCU_TLS(malloc_nesting) =3D=3D = 1) {
- tracepoint(ust_libc, free, ptr);
+ tracepo= int(ust_libc, free, ptr, __builtin_return_address(0) );
  = }
 
  if (cur_alloc.free =3D=3D NULL) {
@@ -308,7 +308,7 @@
  }
  re= tval =3D cur_alloc.calloc(nmemb, size);
  if (URCU_TLS(mal= loc_nesting) =3D=3D 1) {
- tracepoint(ust_libc, calloc, nmemb, = size, retval);
+ tracepoint(ust_libc, calloc, nmemb, size, retv= al, __builtin_return_address(0) );
  }
  = URCU_TLS(malloc_nesting)--;
  return retval;
@= @ -360,7 +360,7 @@
  retval =3D cur_alloc.realloc(ptr, siz= e);
 end:
  if (URCU_TLS(malloc_nesting) = =3D=3D 1) {
- tracepoint(ust_libc, realloc, ptr, size, retval);=
+ tracepoint(ust_libc, realloc, ptr, size, retval, __builtin_r= eturn_address(0) );
  }
  URCU_TLS(malloc= _nesting)--;
  return retval;
@@ -380,7 +380= ,7 @@
  }
  retval =3D cur_alloc.memalign= (alignment, size);
  if (URCU_TLS(malloc_nesting) =3D=3D 1= ) {
- tracepoint(ust_libc, memalign, alignment, size, retval);<= /span>
+ tracepoint(ust_libc, memalign, alignment, size, retval, __bui= ltin_return_address(0) );
  }
  URCU_TLS(= malloc_nesting)--;
  return retval;
@@ -401,7= +401,7 @@
  retval =3D cur_alloc.posix_memalign(memptr, a= lignment, size);
  if (URCU_TLS(malloc_nesting) =3D=3D 1) = {
  tracepoint(ust_libc, posix_memalign, *memptr, alignmen= t, size,
- retval);
+ retval, __builtin_return_addr= ess(0) );
  }
  URCU_TLS(malloc_nesting)-= -;
  return retval;
diff -Nurd b/liblttng-ust-= libc-wrapper/ust_libc.h c/liblttng-ust-libc-wrapper/ust_libc.h
= --- b/liblttng-ust-libc-wrapper/ust_libc.h 2015-01-06 17:14:34.000000000 +0= 100
+++ c/liblttng-ust-libc-wrapper/ust_libc.h 2015-01-06 17:16= :40.811145106 +0100
@@ -33,54 +33,60 @@
 #in= clude <lttng/tracepoint.h>
 
 TRA= CEPOINT_EVENT(ust_libc, malloc,
- TP_ARGS(size_t, size, void *,= ptr),
+ TP_ARGS(size_t, size, void *, ptr, void *, ra),=
  TP_FIELDS(
  ctf_integer(size_t, size, size)=
  ctf_integer_hex(void *, ptr, ptr)
+ ctf_int= eger_hex(void *, ra, ra)
  )
 ) 
 TRACEPOINT_EVENT(ust_libc, free,
-= TP_ARGS(void *, ptr),
+ TP_ARGS(void *, ptr, void *, ra),
  TP_FIELDS(
  ctf_integer_hex(void *, ptr, p= tr)
+ ctf_integer_hex(void *, ra, ra)
  )
 )
 
 TRACEPOINT_EVENT(ust_l= ibc, calloc,
- TP_ARGS(size_t, nmemb, size_t, size, void *, p= tr),
+ TP_ARGS(size_t, nmemb, size_t, size, void *, ptr, void *= , ra),
  TP_FIELDS(
  ctf_integer(size_t,= nmemb, nmemb)
  ctf_integer(size_t, size, size)  ctf_integer_hex(void *, ptr, ptr)
+ ctf_integer_hex(= void *, ra, ra)
  )
 )
 =
 TRACEPOINT_EVENT(ust_libc, realloc,
- TP_ARG= S(void *, in_ptr, size_t, size, void *, ptr),
+ TP_ARGS(void *,= in_ptr, size_t, size, void *, ptr, void *, ra),
  TP_FIEL= DS(
  ctf_integer_hex(void *, in_ptr, in_ptr)
=   ctf_integer(size_t, size, size)
  ctf_integer_hex(v= oid *, ptr, ptr)
+ ctf_integer_hex(void *, ra, ra)
=   )
 )
 
 TRACEPOIN= T_EVENT(ust_libc, memalign,
- TP_ARGS(size_t, alignment, size_t= , size, void *, ptr),
+ TP_ARGS(size_t, alignment, size_t, size= , void *, ptr, void *, ra),
  TP_FIELDS(
 = ; ctf_integer(size_t, alignment, alignment)
  ctf_integer(= size_t, size, size)
  ctf_integer_hex(void *, ptr, ptr)
+ ctf_integer_hex(void *, ra, ra)
  )
=  )
 
 TRACEPOINT_EVENT(ust_libc,= posix_memalign,
- TP_ARGS(void *, out_ptr, size_t, alignment, = size_t, size, int, result),
+ TP_ARGS(void *, out_ptr, size_t, = alignment, size_t, size, int, result, void *, ra),
  TP_FI= ELDS(
  ctf_integer_hex(void *, out_ptr, out_ptr)  ctf_integer(size_t, alignment, alignment)
  ct= f_integer(size_t, size, size)
  ctf_integer(int, result, r= esult)
+ ctf_integer_hex(void *, ra, ra)
  )<= /span>
 )
 
Best regards,

=
Olivier Delbeke Senior Software Engineer
Olivier.Delbeke@awtce.be / T. +32 2 389 25 53
 AWTC Europe S.A. - Avenue de l=E2=80=99Industrie, 19 - 1420 Braine-l=E2= =80=99Alleud - Belgium - www.aweurope.eu - www.aisin-aw.co.jp
VAT : BE 0= 474.474.114 - RPM Nivelles 


This mail, and any attachments thereto, is intended= only for use by the addressee(s) named herein and may contain legally priv= ileged and/or confidential information. If you are not the intended recipie= nt, please note that any review, dissemination, disclosure, alteration, pri= nting, copying or transmission of this mail and/or any file transmitted wit= h it, is strictly prohibited and may be unlawful. If you have received this= mail by mistake, please immediately notify the sender as well as our mail = administrator at postmaster@aweurope.be, and permanently destroy the origin= al as well as any copy thereof.


____________________________= ___________________
lttng-dev mailing list
lttng-dev@lists.lttng.org<= br>http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev



--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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