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Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESE
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From: |
Peter Xu |
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Subject: |
Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE |
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Date: |
Fri, 5 Mar 2021 10:42:06 -0500 |
On Fri, Mar 05, 2021 at 11:16:33AM +0100, David Hildenbrand wrote:
> +#define OVERCOMMIT_MEMORY_PATH "/proc/sys/vm/overcommit_memory"
> +static bool map_noreserve_effective(int fd, bool readonly, bool shared)
> +{
[...]
> @@ -184,8 +251,7 @@ void *qemu_ram_mmap(int fd,
> size_t offset, total;
> void *ptr, *guardptr;
>
> - if (noreserve) {
> - error_report("Skipping reservation of swap space is not supported");
> + if (noreserve && !map_noreserve_effective(fd, shared, readonly)) {
Need to switch "shared" & "readonly"?
> return MAP_FAILED;
> }
--
Peter Xu
- [PATCH v2 0/9] RAM_NORESERVE, MAP_NORESERVE and hostmem "reserve" property, David Hildenbrand, 2021/03/05
- [PATCH v2 1/9] softmmu/physmem: Drop "shared" parameter from ram_block_add(), David Hildenbrand, 2021/03/05
- [PATCH v2 2/9] util/mmap-alloc: Factor out calculation of the pagesize for the guard page, David Hildenbrand, 2021/03/05
- [PATCH v2 3/9] util/mmap-alloc: Factor out reserving of a memory region to mmap_reserve(), David Hildenbrand, 2021/03/05
- [PATCH v2 4/9] util/mmap-alloc: Factor out activating of memory to mmap_activate(), David Hildenbrand, 2021/03/05
- [PATCH v2 5/9] softmmu/memory: Pass ram_flags into qemu_ram_alloc_from_fd(), David Hildenbrand, 2021/03/05
- [PATCH v2 6/9] softmmu/memory: Pass ram_flags into memory_region_init_ram_shared_nomigrate(), David Hildenbrand, 2021/03/05
- [PATCH v2 7/9] memory: introduce RAM_NORESERVE and wire it up in qemu_ram_mmap(), David Hildenbrand, 2021/03/05
- [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, David Hildenbrand, 2021/03/05
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE,
Peter Xu <=
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, David Hildenbrand, 2021/03/05
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, Peter Xu, 2021/03/05
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, David Hildenbrand, 2021/03/05
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, David Hildenbrand, 2021/03/07
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, Marcel Apfelbaum, 2021/03/07
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, David Hildenbrand, 2021/03/08
- Re: [PATCH v2 8/9] util/mmap-alloc: Support RAM_NORESERVE via MAP_NORESERVE, Marcel Apfelbaum, 2021/03/08
[PATCH v2 9/9] hostmem: Wire up RAM_NORESERVE via "reserve" property, David Hildenbrand, 2021/03/05