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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732265377; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=KNZQI7ylQIOE/iFKodvgac7pAsGuEdA32WTqOV4P8pA=; b=dSnVKCdOVv+aYt8tuCUbMzLJgKKcx1SRV5kLke2go3NWC7LvNsTtPRy+WrpkSi1vEMbb6E lKUnXUiSmDHuN9Yt8Y3O0sp1hHi704t8e4yP9ymriUqewCn5T9nChZlOVNi2KcM6bwvU5D xh6pr6by+98l1XiPTpjk++52Y/6h4kk= X-MC-Unique: DhqWTc0dM3CMu00N60iOKA-1 X-Mimecast-MFC-AGG-ID: DhqWTc0dM3CMu00N60iOKA From: Thomas Huth To: qemu-devel@nongnu.org Cc: qemu-trivial@nongnu.org, Eduardo Habkost , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Yanan Wang , Zhao Liu Subject: [RFC PATCH for-10.0] include/hw/boards: Optimize the booleans in MachineClass Date: Fri, 22 Nov 2024 09:49:23 +0100 Message-ID: <20241122084923.1542743-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" While looking at the QEMU binary with "pahole", I noticed that we could optimize the size of MachineClass a little bit: So far we are using a mixture of a bitfield and single "bool" members here for the boolean flags. Declaring all flags as part of the bitfield helps to shrink the size of the struct a little bit. Signed-off-by: Thomas Huth --- It's just a micro-optimization (the size of the struct decreases by eight bytes), so I'm not sure whether it's worth the effort...? include/hw/boards.h | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/include/hw/boards.h b/include/hw/boards.h index 36fbb9b59d..c6946bd319 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -285,8 +285,16 @@ struct MachineClass { no_cdrom:1, no_sdcard:1, pci_allow_0_address:1, - legacy_fw_cfg_order:1; - bool is_default; + legacy_fw_cfg_order:1, + is_default:1, + auto_enable_numa_with_memhp:1, + auto_enable_numa_with_memdev:1, + ignore_boot_device_suffixes:1, + smbus_no_migration_support:1, + nvdimm_supported:1, + numa_mem_supported:1, + auto_enable_numa:1, + cpu_cluster_has_numa_boundary:1; const char *default_machine_opts; const char *default_boot_order; const char *default_display; @@ -304,14 +312,6 @@ struct MachineClass { int numa_mem_align_shift; const char * const *valid_cpu_types; strList *allowed_dynamic_sysbus_devices; - bool auto_enable_numa_with_memhp; - bool auto_enable_numa_with_memdev; - bool ignore_boot_device_suffixes; - bool smbus_no_migration_support; - bool nvdimm_supported; - bool numa_mem_supported; - bool auto_enable_numa; - bool cpu_cluster_has_numa_boundary; SMPCompatProps smp_props; const char *default_ram_id; =20 --=20 2.47.0