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Author SHA1 Message Date
Michael Kerrisk c7faf9452e process_madvise.2: Defer to madvise(2) for description of 'advice' flags 
Rather than repeating the description of MADV_COLD and MADV_PAGEOUT
in two pages, centralize the discussion in madvise(2), and refer
from process_madvise(2) ro madvise(2).

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-13 23:03:06 +01:00
Michael Kerrisk 8d010a0673 process_madvise.2: Minor clarification regarding partial advice scenario 
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-13 21:10:04 +01:00
Alejandro Colomar 147ad5cedc process_madvise.2: SYNOPSIS: Fix prototype parameter type 
The type of vlen is 'size_t', and not 'unsigned int'.  Fix it.

......

$ grep_syscall process_madvise
mm/madvise.c:1161:
SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec,
		size_t, vlen, int, behavior, unsigned int, flags)
include/linux/syscalls.h:887:
asmlinkage long sys_process_madvise(int pidfd, const struct iovec __user *vec,
			size_t vlen, int behavior, unsigned int flags);

function grep_syscall()
{
	if ! [ -v 1 ]; then
		>&2 echo "Usage: ${FUNCNAME[0]} <syscall>";
		return ${EX_USAGE};
	fi

	find * -type f \
	|grep '\.c$' \
	|sort -V \
	|xargs pcregrep -Mn "(?s)^\w*SYSCALL_DEFINE.\(${1},.*?\)" \
	|sed -E 's/^[^:]+:[0-9]+:/&\n/';

	find * -type f \
	|grep '\.[ch]$' \
	|sort -V \
	|xargs pcregrep -Mn "(?s)^asmlinkage\s+[\w\s]+\**sys_${1}\s*\(.*?\)" \
	|sed -E 's/^[^:]+:[0-9]+:/&\n/';
}

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-13 16:44:46 +01:00
Alejandro Colomar 904291a421 process_madvise.2: Add note about missing glibc wrapper 
Glibc bug: <https://sourceware.org/bugzilla/show_bug.cgi?id=27380>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-13 16:42:18 +01:00
Michael Kerrisk 3aac0708a9 process_madvise.2: Restructure the text in DESCRIPTION a little 
The 'advice' subsection fell in the middle of other text in the
DESCRIPTION, which is a little confusing. Instead, move that
subsection to the end of the DESCRIPTION, and make some other
minor text reorganization so that related details are placed in
the same paragraphs.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-02 11:43:15 +01:00
Michael Kerrisk e3ce016472 process_madvise.2: Minor edits to Suren Baghdasaryan's patch 
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-02 11:43:15 +01:00
Suren Baghdasaryan a144f458ba process_madvise.2: Document process_madvise(2) 
Initial version of process_madvise(2) manual page. Initial text
was extracted from [1], amended after fix [2] and more details
added using man pages of madvise(2) and process_vm_readv(2) as
examples. It also includes the changes to required permission
proposed in [3].

[1] https://lore.kernel.org/patchwork/patch/1297933/
[2] https://lkml.org/lkml/2020/12/8/1282
[3] https://patchwork.kernel.org/project/selinux/patch/20210111170622.2613577-1-surenb@google.com/#23888311

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 2021-02-02 11:43:00 +01:00