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Wed, 20 May 2026 05:11:10 -0700 (PDT) Message-ID: <7a2fb6cc-fc9b-43c1-9f4f-d5a573d52dbc@suse.com> Date: Wed, 20 May 2026 14:11:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Teddy Astie From: Jan Beulich Subject: [PATCH] x86: strip debug info for intermediate linking steps Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL Content-Transfer-Encoding: quoted-printable X-purgate-ID: tlsNG-4011c0/1779279070-72F718B7-58021305/0/0 X-purgate-type: clean X-purgate-size: 2967 X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1779279087882158500 Content-Type: text/plain; charset="utf-8" Linking debug info takes time, especially for xen.efi. At the same time symbol table contents aren't affected by presence / absence of debug info in the linked binaries (the ELF and COFF symbol tables would have extra section symbols, but tools/symbols omits those anyway). Signed-off-by: Jan Beulich --- The main speed gain is from xen.efi linking. Therefore I'm not even sure if this wants mirroring to the other targets, where only xen-syms is produced. It would mainly be some transient space saving there. (It would perhaps want retaining when the linking steps are moved to common code.) Thoughts? On the system I measured this on, "real" time went down from 4.9s to 3.9s, while "user" time went from 7.8s to 6.8s (all approximate values of course, as there naturally is a bit of variance, and all for full incremental builds with no other changes, i.e. mainly the final linking steps getting carried out for the common/version.o change). --- a/xen/arch/x86/Makefile +++ b/xen/arch/x86/Makefile @@ -127,13 +127,13 @@ CFLAGS-$(XEN_BUILD_EFI) +=3D -DXEN_BUILD_E $(TARGET)-syms: $(objtree)/prelink.o $(obj)/xen.lds $(objtree)/tools/symbols $(all_symbols) --empty > $(dot-target).0.S $(MAKE) $(build)=3D$(@D) $(dot-target).0.o - $(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) \ + $(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) --strip-debu= g \ $(dot-target).0.o -o $(dot-target).0 $(NM) -pa --format=3Dsysv $(dot-target).0 \ | $(objtree)/tools/symbols $(all_symbols) --sysv --sort \ > $(dot-target).1.S $(MAKE) $(build)=3D$(@D) $(dot-target).1.o - $(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) \ + $(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) --strip-debu= g \ $(dot-target).1.o -o $(dot-target).1 $(NM) -pa --format=3Dsysv $(dot-target).1 \ | $(objtree)/tools/symbols $(all_symbols) --sysv --sort $(syms-warn-dup-= y) \ @@ -205,7 +205,7 @@ endif $(MAKE) $(build)=3D$(@D) .$(@F).0s.o $(foreach base, $(VIRT_BASE) $(ALT_BASE), \ $(LD) $(call EFI_LDFLAGS,$(base)) -T $(obj)/efi.lds $< $(relocs= -dummy) \ - $(dot-target).0s.o $(note_file_option) \ + $(dot-target).0s.o $(note_file_option) --strip-debug \ -o $(dot-target).$(base).0 &&) : $(MKRELOC) $(foreach base,$(VIRT_BASE) $(ALT_BASE),$(dot-target).$(base).= 0) \ > $(dot-target).1r.S @@ -215,7 +215,7 @@ endif > $(dot-target).1s.S $(MAKE) $(build)=3D$(@D) .$(@F).1r.o .$(@F).1s.o $(foreach base, $(VIRT_BASE) $(ALT_BASE), \ - $(LD) $(call EFI_LDFLAGS,$(base)) -T $(obj)/efi.lds $< \ + $(LD) $(call EFI_LDFLAGS,$(base)) -T $(obj)/efi.lds $< --strip= -debug \ $(dot-target).1r.o $(dot-target).1s.o $(note_file_option)= \ -o $(dot-target).$(base).1 &&) : $(MKRELOC) $(foreach base,$(VIRT_BASE) $(ALT_BASE),$(dot-target).$(base).= 1) \