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ntdll: Use pread in NtQueryVirtualMemory(MemoryWorkingSetExInformation).

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1 syscall instead of 2 syscalls. Faster and simpler code.
This commit is contained in:
Witold Baryluk 2022-09-15 17:21:36 +00:00 committed by Alexandre Julliard
parent 96a4a2b4c4
commit ffab9d9747
1 changed files with 7 additions and 7 deletions
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14
dlls/ntdll/unix/virtual.c
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@ -4203,7 +4203,7 @@ static NTSTATUS get_working_set_ex( HANDLE process, LPCVOID addr,
MEMORY_WORKING_SET_EX_INFORMATION *info,
SIZE_T len, SIZE_T *res_len )
{
FILE *f = NULL;
int pagemap_fd;
MEMORY_WORKING_SET_EX_INFORMATION *p;
sigset_t sigset;
@ -4266,8 +4266,8 @@ static NTSTATUS get_working_set_ex( HANDLE process, LPCVOID addr,
procstat_close( pstat );
}
#else
f = fopen( "/proc/self/pagemap", "rb" );
if (!f)
pagemap_fd = open( "/proc/self/pagemap", O_RDONLY, 0 );
if (pagemap_fd == -1)
{
static int once;
if (!once++) WARN( "unable to open /proc/self/pagemap\n" );
@ -4286,8 +4286,8 @@ static NTSTATUS get_working_set_ex( HANDLE process, LPCVOID addr,
get_committed_size( view, p->VirtualAddress, &vprot, VPROT_COMMITTED ) &&
(vprot & VPROT_COMMITTED))
{
if (!f || fseek( f, ((UINT_PTR)p->VirtualAddress >> page_shift) * sizeof(pagemap), SEEK_SET ) == -1 ||
fread( &pagemap, sizeof(pagemap), 1, f ) != 1)
if (pagemap_fd == -1 ||
pread( pagemap_fd, &pagemap, sizeof(pagemap), ((UINT_PTR)p->VirtualAddress >> page_shift) * sizeof(pagemap) ) != sizeof(pagemap))
{
/* If we don't have pagemap information, default to invalid. */
pagemap = 0;
@ -4304,8 +4304,8 @@ static NTSTATUS get_working_set_ex( HANDLE process, LPCVOID addr,
server_leave_uninterrupted_section( &virtual_mutex, &sigset );
#endif
if (f)
fclose( f );
if (pagemap_fd != -1)
close( pagemap_fd );
if (res_len)
*res_len = (UINT_PTR)p - (UINT_PTR)info;
return STATUS_SUCCESS;