From c51d84dc09476d9c06b8aac726220bf3c7d62e8d Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Mon, 23 Sep 2013 17:23:35 -0500 Subject: support acpi firmware performance data (FPDT) Prefer firmware-provided performance data over loader-exported ones; if ACPI data is available, always use it, otherwise try to read the loader data. The firmware-provided variables start at the time the first EFI image is executed and end when the operating system exits the boot services; the (loader) time calculated in systemd-analyze increases. --- src/shared/boot-timestamps.c | 65 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 src/shared/boot-timestamps.c (limited to 'src/shared/boot-timestamps.c') diff --git a/src/shared/boot-timestamps.c b/src/shared/boot-timestamps.c new file mode 100644 index 0000000000..944996582e --- /dev/null +++ b/src/shared/boot-timestamps.c @@ -0,0 +1,65 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2012 Lennart Poettering + Copyright 2013 Kay Sievers + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ +#include + +#include "boot-timestamps.h" +#include "acpi-fpdt.h" +#include "efivars.h" + +int boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) { + usec_t x, y, a; + int r; + dual_timestamp _n; + + assert(firmware); + assert(loader); + + if (!n) { + dual_timestamp_get(&_n); + n = &_n; + } + + r = acpi_get_boot_usec(&x, &y); + if (r < 0) { + r = efi_loader_get_boot_usec(&x, &y); + if (r < 0) + return r; + } + + /* Let's convert this to timestamps where the firmware + * began/loader began working. To make this more confusing: + * since usec_t is unsigned and the kernel's monotonic clock + * begins at kernel initialization we'll actually initialize + * the monotonic timestamps here as negative of the actual + * value. */ + + firmware->monotonic = y; + loader->monotonic = y - x; + + a = n->monotonic + firmware->monotonic; + firmware->realtime = n->realtime > a ? n->realtime - a : 0; + + a = n->monotonic + loader->monotonic; + loader->realtime = n->realtime > a ? n->realtime - a : 0; + + return 0; +} -- cgit v1.2.3-54-g00ecf