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mail(1) - string relaxation
Hello,
i've implemented string relaxation in the S-nail(1) codebase and
gained massive reduction of memory overhead.
Since this thing is an exploded BSD Mail i thought doing the same
for NetBSD mail(1) wouldn't be something bad, but it seems the
wins are not comparable dramatic, most likely because of the
completely different MIME approach. Still there is a win,
especially with large mailboxes (many messages that is) which need
to be updated (after 'unre'ing a message, for example).
This diff should work just fine, even if the signal handling of
NetBSD mail(1) is far more improved in comparison; (note that,
because of the sreset() that happens on each command loop tick,
even the other case would likely survive (in fact i'm not quite
sure if the recursion doesn't simply jump away, but if so,
again..)).
(And note my repo hasn't been updated for about two months, i'm
behind GPRS most of the time, but i don't remember any mail
change? On interest and otherwise i'll update and resend.)
Ciao,
--steffen
diff -Napru nmail/cmd1.c nmail.relax/cmd1.c
--- nmail/cmd1.c 2013-12-09 13:16:52.000000000 +0100
+++ nmail.relax/cmd1.c 2013-12-09 19:09:03.000000000 +0100
@@ -124,13 +124,16 @@ headers(void *v)
flag = 0;
if (dot != get_message(n))
dot = mp;
+ srelax_on();
for (/*EMPTY*/; mp; mp = next_message(mp)) {
if (mp->m_flag & MDELETED)
continue;
if (flag++ >= size)
break;
printhead(get_msgnum(mp));
+ srelax();
}
+ srelax_off();
if (flag == 0) {
(void)printf("No more mail.\n");
return 1;
@@ -343,6 +346,7 @@ type1(int *msgvec, int doign, int mime_d
* exit code will never be seen.
*/
sig_check();
+ srelax_on();
oldsigpipe = sig_signal(SIGPIPE, cmd1_brokpipe);
if (setjmp(pipestop))
goto close_pipe;
@@ -365,8 +369,10 @@ type1(int *msgvec, int doign, int mime_d
args.mip = NULL;
#endif
(void)thread_recursion(mp, type1_core, &args);
+ srelax();
}
close_pipe:
+ srelax_off();
#ifdef MIME_SUPPORT
if (mip != NULL) {
struct sigaction osa;
@@ -549,6 +555,7 @@ top(void *v)
args.lineb = 1;
recursive = do_recursion();
msgCount = get_msgCount();
+ srelax_on();
for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
struct message *mp;
@@ -556,7 +563,9 @@ top(void *v)
dot = mp;
args.parent = recursive ? mp : NULL;
(void)thread_recursion(mp, top_core, &args);
+ srelax();
}
+ srelax_off();
return 0;
}
diff -Napru nmail/cmd2.c nmail.relax/cmd2.c
--- nmail/cmd2.c 2013-12-09 13:16:52.000000000 +0100
+++ nmail.relax/cmd2.c 2013-12-09 19:02:25.000000000 +0100
@@ -234,6 +234,7 @@ save1(char str[], int markmsg, const cha
warn(NULL);
return 1;
}
+ srelax_on();
for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
struct save1_core_args_s args;
struct message *mp;
@@ -245,9 +246,12 @@ save1(char str[], int markmsg, const cha
if (thread_recursion(mp, save1_core, &args)) {
warn("%s", fn);
(void)Fclose(obuf);
+ srelax_off();
return 1;
}
+ srelax();
}
+ srelax_off();
(void)fflush(obuf);
if (ferror(obuf))
warn("%s", fn);
@@ -690,6 +694,7 @@ detach1(void *v, int do_unnamed)
msgvec[1] = 0;
}
recursive = do_recursion();
+ srelax_on();
for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
struct detach1_core_args_s args;
struct message *mp;
@@ -700,7 +705,9 @@ detach1(void *v, int do_unnamed)
args.igtab = do_unnamed ? detachall : ignoreall;
args.dstdir = dstdir;
(void)thread_recursion(mp, detach1_core, &args);
+ srelax();
}
+ srelax_off();
return 0;
}
diff -Napru nmail/extern.h nmail.relax/extern.h
--- nmail/extern.h 2013-12-09 13:16:52.000000000 +0100
+++ nmail.relax/extern.h 2013-12-09 18:36:12.000000000 +0100
@@ -278,6 +278,9 @@ int sendmail(void *);
void * csalloc(size_t, size_t);
void * salloc(size_t);
void sreset(void);
+void srelax_on(void);
+void srelax_off(void);
+void srelax(void);
void spreserve(void);
/*
diff -Napru nmail/list.c nmail.relax/list.c
--- nmail/list.c 2013-12-09 13:16:52.000000000 +0100
+++ nmail.relax/list.c 2013-12-09 19:06:33.000000000 +0100
@@ -845,6 +845,7 @@ match_string(int *markarray, char *str,
return -1;
rval = 0;
+ srelax_on();
for (i = 1; i <= msgCount; i++) {
struct message *mp;
mp = get_message(i);
@@ -854,7 +855,9 @@ match_string(int *markarray, char *str,
if (rval)
markarray[i - 1] = 1;
rval = 0;
+ srelax();
}
+ srelax_off();
free_cmparg(cmparg); /* free any memory allocated by get_cmpfn() */
@@ -1325,9 +1328,13 @@ show_headers_and_exit(int flags)
(void)signal(SIGINT, SIG_IGN);
flags &= CMMASK;
+ srelax_on();
for (mp = get_message(1); mp; mp = next_message(mp))
- if (flags == 0 || !ignore_message(mp->m_flag, flags))
+ if (flags == 0 || !ignore_message(mp->m_flag, flags)) {
printhead(get_msgnum(mp));
+ srelax();
+ }
+ srelax_off();
exit(0);
/* NOTREACHED */
diff -Napru nmail/quit.c nmail.relax/quit.c
--- nmail/quit.c 2013-12-09 13:16:52.000000000 +0100
+++ nmail.relax/quit.c 2013-12-09 18:59:56.000000000 +0100
@@ -95,15 +95,19 @@ writeback(FILE *res)
}
}
#endif
+ srelax_on();
for (mp = get_message(1); mp; mp = next_message(mp))
if ((mp->m_flag & MPRESERVE) || (mp->m_flag & MTOUCH)==0) {
p++;
if (sendmessage(mp, obuf, NULL, NULL, NULL) < 0) {
warn("%s", mailname);
(void)Fclose(obuf);
+ srelax_off();
return -1;
}
+ srelax();
}
+ srelax_off();
#ifdef APPEND
if (res != NULL)
while ((c = getc(res)) != EOF)
@@ -221,16 +225,20 @@ edstop(jmp_buf jmpbuf)
}
trunc(obuf);
c = 0;
+ srelax_on();
for (mp = get_message(1); mp; mp = next_message(mp)) {
if ((mp->m_flag & MDELETED) != 0)
continue;
c++;
if (sendmessage(mp, obuf, NULL, NULL, NULL) < 0) {
warn("%s", mailname);
+ srelax_off();
sig_release();
longjmp(jmpbuf, -1);
}
+ srelax();
}
+ srelax_off();
gotcha = (c == 0 && ibuf == NULL);
if (ibuf != NULL) {
while ((c = getc(ibuf)) != EOF)
@@ -480,17 +488,22 @@ nolock:
}
(void)fchmod(fileno(obuf), 0600);
}
+ srelax_on();
for (mp = get_message(1); mp; mp = next_message(mp))
- if (mp->m_flag & MBOX)
+ if (mp->m_flag & MBOX) {
if (sendmessage(mp, obuf, saveignore, NULL, NULL) < 0) {
warn("%s", mbox);
if (!append)
(void)Fclose(ibuf);
(void)Fclose(obuf);
(void)Fclose(fbuf);
+ srelax_off();
dot_unlock(mailname);
return;
}
+ srelax();
+ }
+ srelax_off();
/*
* Copy the user's old mbox contents back
diff -Napru nmail/strings.c nmail.relax/strings.c
--- nmail/strings.c 2013-12-09 13:16:52.000000000 +0100
+++ nmail.relax/strings.c 2013-12-09 20:08:08.000000000 +0100
@@ -38,6 +38,8 @@ __RCSID("$NetBSD: strings.c,v 1.18 2010/
#endif
#endif /* not lint */
+#include <assert.h>
+
/*
* Mail -- a mail program
*
@@ -60,10 +62,13 @@ __RCSID("$NetBSD: strings.c,v 1.18 2010/
#define NSPACE 25 /* Total number of string
spaces */
static struct strings {
char *s_topFree; /* Beginning of this area */
+ char *s_relaxFree; /* Begin of area during relaxation */
char *s_nextFree; /* Next alloctable place here */
size_t s_nleft; /* Number of bytes left here */
} stringdope[NSPACE];
+static int relaxation;
+
/*
* Allocate size more bytes of space and return the address of the
* first byte to the caller. An even number of bytes are always
@@ -97,6 +102,7 @@ salloc(size_t size)
sp->s_topFree = malloc(STRINGSIZE << idx);
if (sp->s_topFree == NULL)
errx(EXIT_FAILURE, "No room for space %d", idx);
+ sp->s_relaxFree = NULL;
sp->s_nextFree = sp->s_topFree;
sp->s_nleft = STRINGSIZE << idx;
}
@@ -131,13 +137,64 @@ sreset(void)
if (noreset)
return;
+
+ relaxation = 0;
+
idx = 0;
- for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
+ for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; ++idx, ++sp) {
if (sp->s_topFree == NULL)
continue;
+ sp->s_relaxFree = NULL;
sp->s_nextFree = sp->s_topFree;
sp->s_nleft = STRINGSIZE << idx;
- idx++;
+ }
+}
+
+PUBLIC void
+srelax_on(void)
+{
+ struct strings *sp;
+ int idx;
+
+ assert(relaxation == 0);
+
+ idx = 0;
+ for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; ++idx, ++sp) {
+ if (sp->s_topFree == NULL)
+ continue;
+ sp->s_relaxFree = sp->s_nextFree;
+ }
+
+ relaxation = 1;
+}
+
+PUBLIC void
+srelax_off(void)
+{
+ assert(relaxation == 1);
+
+ srelax();
+ relaxation = 0;
+}
+
+PUBLIC void
+srelax(void)
+{
+ struct strings *sp;
+ int idx;
+
+ assert(relaxation == 1);
+
+ idx = 0;
+ for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; ++idx, ++sp) {
+ if (sp->s_topFree == NULL)
+ continue;
+ sp->s_nleft = STRINGSIZE << idx;
+ if ((sp->s_nextFree = sp->s_relaxFree) == NULL)
+ sp->s_nextFree = sp->s_topFree;
+ else
+ sp->s_nleft -= (size_t)(uintptr_t)(sp->s_relaxFree -
+ sp->s_topFree);
}
}
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