From: Eric Blake <eblake@redhat.com>
To: "Philippe Mathieu-Daudé" <philmd@redhat.com>,
qemu-trivial@nongnu.org, qemu-devel@nongnu.org
Cc: Dmitry Fleytman <dmitry.fleytman@gmail.com>,
Jason Wang <jasowang@redhat.com>,
Christian Schoenebeck <qemu_oss@crudebyte.com>,
Greg Kurz <groug@kaod.org>, Gerd Hoffmann <kraxel@redhat.com>,
Stefano Garzarella <sgarzare@redhat.com>
Subject: Re: [PATCH v2 0/9] hw, ui, virtfs-proxy-helper: Reduce QEMU .data/.rodata/.bss footprint
Date: Thu, 5 Mar 2020 08:21:03 -0600 [thread overview]
Message-ID: <d32c4278-5879-c485-6f02-bdd9d1f890d1@redhat.com> (raw)
In-Reply-To: <20200305124525.14555-1-philmd@redhat.com>
On 3/5/20 6:45 AM, Philippe Mathieu-Daudé wrote:
> Since v1:
> - merged 2 series
> - reworked hw/usb/quirks
> - added R-b/A-b tags
>
> This series reduce the footprint of the QEMU binary:
> .bss: 106KiB (moved to .heap)
Why is moving stuff from .bss to .heap beneficial? With .bss,
0-initialization is cheap (the OS gives it to us for free by mapping the
entire .bss to a copy-on-write zero page); but with .heap, we generally
have to zero it at runtime ourselves.
> .data: 1MiB
> .rodata: 4.34MiB
But reducing these sizes makes sense.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
prev parent reply other threads:[~2020-03-05 14:22 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-05 12:45 [PATCH v2 0/9] hw, ui, virtfs-proxy-helper: Reduce QEMU .data/.rodata/.bss footprint Philippe Mathieu-Daudé
2020-03-05 12:45 ` [PATCH v2 1/9] hw/audio/fmopl: Fix a typo twice Philippe Mathieu-Daudé
2020-03-05 13:38 ` Stefano Garzarella
2020-03-09 11:36 ` Laurent Vivier
2020-03-05 12:45 ` [PATCH v2 2/9] hw/audio/fmopl: Move ENV_CURVE to .heap to save 32KiB of .bss Philippe Mathieu-Daudé
2020-03-05 13:44 ` Stefano Garzarella
2020-03-05 13:48 ` Stefano Garzarella
2020-03-05 13:50 ` Philippe Mathieu-Daudé
2020-03-05 13:59 ` Stefano Garzarella
2020-03-05 13:49 ` Philippe Mathieu-Daudé
2020-03-05 13:54 ` Daniel P. Berrangé
2020-03-05 12:45 ` [PATCH v2 3/9] hw/audio/intel-hda: Use memory region alias to reduce .rodata by 4.34MB Philippe Mathieu-Daudé
2020-03-05 12:45 ` [PATCH v2 4/9] hw/net/e1000: Add readops/writeops typedefs Philippe Mathieu-Daudé
2020-03-05 12:45 ` [PATCH v2 5/9] hw/net/e1000: Move macreg[] arrays to .rodata to save 1MiB of .data Philippe Mathieu-Daudé
2020-03-05 12:45 ` [PATCH v2 6/9] hw/usb/quirks: Use smaller types to reduce .rodata by 10KiB Philippe Mathieu-Daudé
2020-03-05 12:45 ` [PATCH v2 7/9] ui/curses: Make control_characters[] array const Philippe Mathieu-Daudé
2020-03-05 13:46 ` Stefano Garzarella
2020-03-05 12:45 ` [PATCH v2 8/9] ui/curses: Move arrays to .heap to save 74KiB of .bss Philippe Mathieu-Daudé
2020-03-05 12:45 ` [PATCH v2 9/9] virtfs-proxy-helper: Make the helper_opts[] array const Philippe Mathieu-Daudé
2020-03-05 13:15 ` [PATCH v2 0/9] hw, ui, virtfs-proxy-helper: Reduce QEMU .data/.rodata/.bss footprint no-reply
2020-03-05 13:25 ` no-reply
2020-03-05 13:42 ` Daniel P. Berrangé
2020-03-05 13:56 ` Philippe Mathieu-Daudé
2020-03-05 14:34 ` Eric Blake
2020-03-05 14:32 ` Eric Blake
2020-03-05 13:48 ` no-reply
2020-03-05 14:21 ` Eric Blake [this message]
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