linux-kernel - [PATCH] scripts/bloat-o-meter: ignore __noinstr_text

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Message-ID: <20260117083448.3877418-1-edumazet@google.com>
Date: Sat, 17 Jan 2026 08:34:47 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com>, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH] scripts/bloat-o-meter: ignore __noinstr_text_start

__noinstr_text_start is adding noise to the script, ignore it.

For instance using __always_inline on __skb_incr_checksum_unnecessary
and CC=clang build.

Before this patch, __noinstr_text_start can show up and confuse us.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/2 grow/shrink: 3/0 up/down: 212/-206 (6)
Function                                     old     new   delta
tcp6_gro_complete                            208     283     +75
tcp4_gro_complete                            376     449     +73
__noinstr_text_start                        3536    3600     +64
__pfx___skb_incr_checksum_unnecessary         32       -     -32
__skb_incr_checksum_unnecessary              174       -    -174
Total: Before=25509464, After=25509470, chg +0.00%

After this patch we have a more precise result.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/2 grow/shrink: 2/0 up/down: 148/-206 (-58)
Function                                     old     new   delta
tcp6_gro_complete                            208     283     +75
tcp4_gro_complete                            376     449     +73
__pfx___skb_incr_checksum_unnecessary         32       -     -32
__skb_incr_checksum_unnecessary              174       -    -174
Total: Before=25505928, After=25505870, chg -0.00%

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 scripts/bloat-o-meter | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter
index 888ce286a351e6e324374396036de48777e2c50d..db5dd18dc2d58eff9ec028e2411a303aad07db38 100755
--- a/scripts/bloat-o-meter
+++ b/scripts/bloat-o-meter
@@ -42,6 +42,7 @@ def getsizes(file, format):
                 if name.startswith("__se_sys"): continue
                 if name.startswith("__se_compat_sys"): continue
                 if name.startswith("__addressable_"): continue
+                if name.startswith("__noinstr_text_start"): continue
                 if name == "linux_banner": continue
                 if name == "vermagic": continue
                 # statics and some other optimizations adds random .NUMBER

base-commit: d3eeb99bbc99cc5eb94a4a75ed4415a0272254ef
-- 
2.52.0.457.g6b5491de43-goog