Find all needed information about Vdso Support. Below you can see links where you can find everything you want to know about Vdso Support.
https://www.ibm.com/support/knowledgecenter/en/linuxonibm/com.ibm.linux.z.lhdd/lhdd_r_vdsoparm.html
vdso - Optimize system call performance. Use the vdso= kernel parameter to control the vdso support for the gettimeofday, clock_getres, and clock_gettime system calls. The virtual dynamic shared object (vdso) support is a shared library that the kernel maps to all dynamically linked programs. The glibc detects the presence of the vdso and uses ...
https://en.wikipedia.org/wiki/VDSO
vDSO is a memory area allocated in user space which exposes some kernel functionalities. vDSO is dynamically allocated, offers improved safety through memory space randomization, and supports more than 4 system calls. vDSO links are provided via the glibc library. If the kernel does not have vDSO support, a traditional syscall is made.
https://stackoverflow.com/questions/19938324/what-are-vdso-and-vsyscall
Apr 17, 2016 · The vDSO links are provided via the glibc library. The linker will link in the glibc vDSO functionality, provided that such a routine has an accompanying vDSO version, such as gettimeofday. When your program executes, if your kernel does not have vDSO support, a traditional syscall will be made. Credits and useful links :
http://man7.org/linux/man-pages/man7/vdso.7.html
vdso - overview of the virtual ELF dynamic shared object SYNOPSIS top #include <sys/auxv.h> void *vdso = (uintptr_t) getauxval(AT_SYSINFO_EHDR); DESCRIPTION top The "vDSO" (virtual dynamic shared object) is a small shared library that the kernel automatically maps into the address space of all user-space applications.
http://lkml.iu.edu/hypermail/linux/kernel/1207.0/03003.html
From: Will Deacon <will.deacon@xxxxxxx> This patch adds VDSO support for 64-bit applications. The VDSO code is currently used for sys_rt_sigreturn() and optimised gettimeofday()
next prev parent reply index Thread overview: 110+ messages / expand[flatnested] mbox.gz Atom feed top 2019-06-21 9:52 [PATCH v7 00/25] Unify vDSOs across more architectures Vincenzo Frascino 2019-06-21 9:52 ` [PATCH v7 01/25] kernel: Standardize vdso_datapage Vincenzo Frascino 2019-06-24 13:56 ` Catalin Marinas 2019-06-21 9:52 ` [PATCH v7 02 ...
https://github.com/aosp-mirror/platform_bionic/commit/996f6decfad3cb0a3e87c0f7e5c0578ccae45d56
May 30, 2017 · MIPS: 32/64-bit VDSO support File libc/SYSCALLS.TXT is updated to generate bionic's system call wrappers for clock_gettime() & gettimeofday() that will be called if kernel vdso implementations fail to execute.
https://lkml.org/lkml/2020/1/23/228
Jan 23, 2020 · > patch #2 extends ARM64 to support multiple vDSO data pages. > > patch #3 introduces vclock_mode similiar to x86 to allow different > __arch_get_hw_counter() implementations for different clocksources. > > patch #4 maps Hyper-V TSC page into vDSO data page. > > patch #5 allows userspace to read cntvct, so that userspace can
https://unix.stackexchange.com/questions/305432/how-to-build-my-code-to-run-on-a-linux-system-without-vdso-support
linux-vdso.so isn't a normal shared library. It's a virtual library that the kernel automatically maps into the address space of each process to provide some syscalls without a …
https://lkml.org/lkml/2020/1/24/21
Jan 24, 2020 · > > patch #2 extends ARM64 to support multiple vDSO data pages. > > > > patch #3 introduces vclock_mode similiar to x86 to allow different > > __arch_get_hw_counter() implementations for different clocksources. > > > > patch #4 maps Hyper-V TSC page into vDSO data page. > > > > patch #5 allows userspace to read cntvct, so that userspace can
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