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From: Andrew C. M. <and...@gm...> - 2012-03-10 19:06:04
|
> > Hello Andrew, > > I quickly look at your patch. > > In terms of replacement, there are some differences with what I > put in https://bugs.kde.org/show_bug.cgi?id=219156 > E.g., malloc replacement is: > ALLOC_or_NULL(VG_Z_LIBTCMALLOC_SONAME, malloc, malloc); > compared to > ALLOC_or_NULL(GPERFTOOLS_INTERCEPT_ZSONAME, tc_malloc, malloc); > > Checking on libtcmalloc.so, tc_malloc and malloc symbols have the same > address in the lib, so the final redirection effect will be the same. > > However, this introduces a dependency to the (to my knowledge) > non documented symbols tc_malloc and similar. > => using the "standard" names looks preferrable to me. My patch imitated Google's valgrind-variant fork, which intercepts both the normal names and the tc_ names. But there is a comment from kcc that suggests that Google prefers intercepting via the tc_ names and that they would like to eventually remove the non tc_ interceptions: http://code.google.com/p/valgrind-variant/source/browse/trunk/valgrind/coregrind/m_replacemalloc/vg_replace_malloc.c#1067 Perhaps someone on the list from Google would be willing to provide some insight? > > The SONAME configure time option is interesting. > I will see if this can't be done dynamically > with a command line option (i.e. at valgrind startup, rather than > at configure time). That would be pretty cool if it works. Thanks for taking the time to look over my patch, Andrew |
|
From: Philippe W. <phi...@sk...> - 2012-03-10 08:30:00
|
On Thu, 2012-03-08 at 14:35 -0500, Andrew C. Morrow wrote: > For what it is worth, here is the patch that I am currently using. It > installs new-style tc_* interceptions if --enable-gperftools=yes is > provided to configure, and adds additional old-style interceptions if > --enable-gperftools=old is set. You don't need the old-style > interceptions if you are using newer gperftools (1.8 or better I > think). My autotools knowledge is quite limited so this may not be the > best way to do this. > > You can also specify a Z encoded SONAME on the command line via > --enable-gperftools-zso. If the flag is provided, it uses NONE. Hello Andrew, I quickly look at your patch. In terms of replacement, there are some differences with what I put in https://bugs.kde.org/show_bug.cgi?id=219156 E.g., malloc replacement is: ALLOC_or_NULL(VG_Z_LIBTCMALLOC_SONAME, malloc, malloc); compared to ALLOC_or_NULL(GPERFTOOLS_INTERCEPT_ZSONAME, tc_malloc, malloc); Checking on libtcmalloc.so, tc_malloc and malloc symbols have the same address in the lib, so the final redirection effect will be the same. However, this introduces a dependency to the (to my knowledge) non documented symbols tc_malloc and similar. => using the "standard" names looks preferrable to me. The SONAME configure time option is interesting. I will see if this can't be done dynamically with a command line option (i.e. at valgrind startup, rather than at configure time). Philippe |
|
From: Philippe W. <phi...@sk...> - 2012-03-10 08:08:50
|
On Thu, 2012-03-08 at 19:16 +0100, Julian Seward wrote: > On Thursday, March 08, 2012, Philippe Waroquiers wrote: > > On Thu, 2012-03-08 at 12:22 -0500, Andrew C. Morrow wrote: > > > Would a patch that integrated optional support for tcmalloc have a > > > shot at inclusion? If so I'm willing to work on it. > > > > At work, we are using tcmalloc and are maintaining a patch > > to have tcmalloc properly supported [...] > > Philippe, is your patch in the bug tracker somewhere? I have just attached the patch to https://bugs.kde.org/show_bug.cgi?id=219156 Philippe |