systemd/journald-advice-about-use-of-memory.patch

---
 src/journal/catalog.c              |   18 +++++++++++++++++-
 src/journal/journal-authenticate.c |    4 ++--
 src/journal/journal-file.c         |    2 +-
 src/journal/journald-kmsg.c        |    2 +-
 src/journal/mmap-cache.c           |   22 +++++++++++++++++++++-
 5 files changed, 42 insertions(+), 6 deletions(-)

Index: systemd-218/src/journal/catalog.c
===================================================================
--- systemd-218.orig/src/journal/catalog.c
+++ systemd-218/src/journal/catalog.c
@@ -471,9 +471,19 @@ finish:
 
 static int open_mmap(const char *database, int *_fd, struct stat *_st, void **_p) {
         const CatalogHeader *h;
+        static const struct {
+                const int index;
+                int advise;
+        } advises[] = {
+                {0,MADV_WILLNEED},
+                {1,MADV_SEQUENTIAL},
+                {2,MADV_DONTDUMP},
+                {3,MADV_DONTFORK}
+        };
         int fd;
         void *p;
         struct stat st;
+        size_t psize;
 
         assert(_fd);
         assert(_st);
@@ -493,11 +503,17 @@ static int open_mmap(const char *databas
                 return -EINVAL;
         }
 
-        p = mmap(NULL, PAGE_ALIGN(st.st_size), PROT_READ, MAP_SHARED, fd, 0);
+        psize = PAGE_ALIGN(st.st_size);
+        p = mmap(NULL, psize, PROT_READ, MAP_SHARED|MAP_POPULATE|MAP_NONBLOCK, fd, 0);
         if (p == MAP_FAILED) {
                 safe_close(fd);
                 return -errno;
         }
+        for (size_t n = 0; n < sizeof(advises) / sizeof(*advises); ++n) {
+                int r = madvise(p, psize, advises[n].advise);
+                if (r < 0)
+                        log_warning("Failed to give advice about use of memory: %m");
+        }
 
         h = p;
         if (memcmp(h->signature, CATALOG_SIGNATURE, sizeof(h->signature)) != 0 ||
Index: systemd-218/src/journal/journal-authenticate.c
===================================================================
--- systemd-218.orig/src/journal/journal-authenticate.c
+++ systemd-218/src/journal/journal-authenticate.c
@@ -355,7 +355,7 @@ int journal_file_fss_load(JournalFile *f
                 goto finish;
         }
 
-        m = mmap(NULL, PAGE_ALIGN(sizeof(FSSHeader)), PROT_READ, MAP_SHARED, fd, 0);
+        m = mmap(NULL, PAGE_ALIGN(sizeof(FSSHeader)), PROT_READ, MAP_SHARED|MAP_STACK, fd, 0);
         if (m == MAP_FAILED) {
                 m = NULL;
                 r = -errno;
@@ -399,7 +399,7 @@ int journal_file_fss_load(JournalFile *f
                 goto finish;
         }
 
-        f->fss_file = mmap(NULL, PAGE_ALIGN(f->fss_file_size), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+        f->fss_file = mmap(NULL, PAGE_ALIGN(f->fss_file_size), PROT_READ|PROT_WRITE, MAP_SHARED|MAP_STACK, fd, 0);
         if (f->fss_file == MAP_FAILED) {
                 f->fss_file = NULL;
                 r = -errno;
Index: systemd-218/src/journal/journal-file.c
===================================================================
--- systemd-218.orig/src/journal/journal-file.c
+++ systemd-218/src/journal/journal-file.c
@@ -2559,7 +2559,7 @@ int journal_file_open(
                 goto fail;
         }
 
-        f->header = mmap(NULL, PAGE_ALIGN(sizeof(Header)), prot_from_flags(flags), MAP_SHARED, f->fd, 0);
+        f->header = mmap(NULL, PAGE_ALIGN(sizeof(Header)), prot_from_flags(flags), MAP_SHARED|MAP_STACK, f->fd, 0);
         if (f->header == MAP_FAILED) {
                 f->header = NULL;
                 r = -errno;
Index: systemd-218/src/journal/journald-kmsg.c
===================================================================
--- systemd-218.orig/src/journal/journald-kmsg.c
+++ systemd-218/src/journal/journald-kmsg.c
@@ -455,7 +455,7 @@ int server_open_kernel_seqnum(Server *s)
                 return 0;
         }
 
-        p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+        p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED|MAP_STACK, fd, 0);
         if (p == MAP_FAILED) {
                 log_error_errno(errno, "Failed to map sequential number file, ignoring: %m");
                 return 0;
Index: systemd-218/src/journal/mmap-cache.c
===================================================================
--- systemd-218.orig/src/journal/mmap-cache.c
+++ systemd-218/src/journal/mmap-cache.c
@@ -446,6 +446,15 @@ static int add_mmap(
                 void **ret,
                 void **release_cookie) {
 
+        static const struct {
+                const int index;
+                int vise;
+        } ad[] = {
+                {0, MADV_WILLNEED},
+                {1, MADV_SEQUENTIAL},
+                {2, MADV_DONTDUMP},
+                {3, MADV_DONTFORK}
+        };
         uint64_t woffset, wsize;
         Context *c;
         FileDescriptor *f;
@@ -488,7 +497,7 @@ static int add_mmap(
         }
 
         for (;;) {
-                d = mmap(NULL, wsize, prot, MAP_SHARED, fd, woffset);
+                d = mmap(NULL, wsize, prot, MAP_SHARED|MAP_POPULATE|MAP_NONBLOCK, fd, woffset);
                 if (d != MAP_FAILED)
                         break;
                 if (errno != ENOMEM)
@@ -501,6 +510,17 @@ static int add_mmap(
                         return -ENOMEM;
         }
 
+        for (size_t n = 0; n < sizeof(ad) / sizeof(*ad); ++n) {
+                if (ad[n].vise == MADV_DONTFORK) {
+                        int flags = fcntl(fd, F_GETFD);
+                        if (flags < 0 || !(flags & FD_CLOEXEC))
+                                continue;
+                }
+                r = madvise(d, wsize, ad[n].vise);
+                if (r < 0)
+                        log_warning("Failed to give advice about use of memory: %m");
+        }
+
         c = context_add(m, context);
         if (!c)
                 goto outofmem;