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13057e064a
Locking the memory without MCL_ONFAULT instantly prefaults any mmaped anonymous memory with a write-fault, which introduces a lot of extra overhead in terms of memory usage when all you want to do is to prevent kcompactd from migrating and compacting QEMU pages. Add an option to only lock pages lazily as they're faulted by the process by using MCL_ONFAULT if asked. Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru> Link: https://lore.kernel.org/r/20250212143920.1269754-5-d-tatianin@yandex-team.ru Signed-off-by: Peter Xu <peterx@redhat.com>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Global variables that (mostly) should not exist
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*
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* Copyright (c) 2003-2020 QEMU contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "exec/cpu-common.h"
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#include "hw/display/vga.h"
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#include "hw/loader.h"
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#include "hw/xen/xen.h"
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#include "net/net.h"
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#include "system/cpus.h"
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#include "system/system.h"
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bool should_mlock(MlockState state)
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{
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return state == MLOCK_ON || state == MLOCK_ON_FAULT;
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}
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bool is_mlock_on_fault(MlockState state)
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{
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return state == MLOCK_ON_FAULT;
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}
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enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
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int display_opengl;
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const char* keyboard_layout;
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MlockState mlock_state;
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bool enable_cpu_pm;
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int autostart = 1;
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int vga_interface_type = VGA_NONE;
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bool vga_interface_created;
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Chardev *parallel_hds[MAX_PARALLEL_PORTS];
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QEMUOptionRom option_rom[MAX_OPTION_ROMS];
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int nb_option_roms;
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int old_param;
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const char *qemu_name;
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unsigned int nb_prom_envs;
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const char *prom_envs[MAX_PROM_ENVS];
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uint8_t *boot_splash_filedata;
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int only_migratable; /* turn it off unless user states otherwise */
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int icount_align_option;
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/* The bytes in qemu_uuid are in the order specified by RFC4122, _not_ in the
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* little-endian "wire format" described in the SMBIOS 2.6 specification.
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*/
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QemuUUID qemu_uuid;
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bool qemu_uuid_set;
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uint32_t xen_domid;
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enum xen_mode xen_mode = XEN_DISABLED;
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bool xen_domid_restrict;
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bool xen_is_stubdomain;
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struct evtchn_backend_ops *xen_evtchn_ops;
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struct gnttab_backend_ops *xen_gnttab_ops;
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struct foreignmem_backend_ops *xen_foreignmem_ops;
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struct xenstore_backend_ops *xen_xenstore_ops;
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