linux-ext4 - Re: [PATCH 0/4] e2fprogs: compiler fun

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Date:   Wed, 8 Aug 2018 23:20:35 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 0/4] e2fprogs: compiler fun

I've been experimenting with the LTO feature, and interestingly
enough, some executables actually get *bigger*:

   text	   data	    bss	    dec	    hex	filename
  27684	   1408	   1272	  30364	   769c	e2image
  34014	   1448	   1304	  36766	   8f9e	e2image.lto

Net Gain: 21%

Other executables, it's (mostly) a wash:

   text	   data	    bss	    dec	    hex	filename
 285991	  21696	   1128	 308815	  4b64f	e2fsck
 287997	  21696	   1144	 310837	  4be35	e2fsck.lto

Net Gain: 0.65%

And in some cases, it's definitely a win:

   text	   data	    bss	    dec	    hex	filename
1479034	  56898	  27728	1563660	 17dc0c	e2fsck.static
1426183	  56320	  27608	1510111	 170adf	e2fsck.static.lto

Net Savings: 3.4%

					- Ted