Re: [gentoo-user] Re: How safe is it to change vanilla-USE-Flag in glibc?

[Franz Fellner]

On Wed, 06 Jul 2016 15:06:20 +0000, James <wireless@×××××××××××.com> wrote:
> Franz Fellner <alpine.art.de <at> gmail.com> writes:
>
>
> > I have issues with some prgrams eating too much memory. This seems to be
> > related to glibc not trimming as
> > necessary which results in way too much memory still occupied by the
> > program after free()ing memory.
>
> Perhaps you should file a bug, providing some evidence if other distros are
> affected (this suggests it might be a gcc issue) or other distros are not
> affected (this suggests it might be a gentoo pathch issue)?

I mentioned my issues several times with the answer "can't be, the issue is on your side".
When I filed a bug against tmux regarding its memory consumption I got told "glibc is known to do bad things" and I was given this patch for tmux which instantenously solved my issue:

diff --git a/grid.c b/grid.c
index ef7c374..96385f4 100644
--- a/grid.c
+++ b/grid.c
@@ -113,6 +113,8 @@ grid_destroy(struct grid *gd)
 	free(gd->linedata);
 
 	free(gd);
+
+	malloc_trim(0);
 }
 
 /* Compare grids. */
@@ -326,6 +328,8 @@ grid_clear_lines(struct grid *gd, u_int py, u_int ny)
 		free(gl->celldata);
 		memset(gl, 0, sizeof *gl);
 	}
+
+	malloc_trim(0);
 }
 
 /* Move a group of lines. */

I have some other applications that are unusable to a certain degree. Having to patch every single application isn't possible, I want to get to the root of the issue :) And USE=vanilla is my first attempt.

Thx
Franz