[vdr] "fast" memory model .. ?!

[Sven Goethel <sgoethel@jausoft.com>]

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last time i patched around bitstreamout,
i thought about to force memory into RAM,
to have it fast and responsiveness ... -> no swapping , no moving around ..
especially for kinda ringbuffers ..

this makes a positive difference within a heavy load environment,
e.g. many recordings and transfere streams .. encodings etc.

so instead of "just" call alloc, i use:

+++
    if ((shmfd = shm_open("/vdr_bitstreamout_memory", O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
        esyslog("cBitStreamOut::Start() shm_open failed: %s\n", strerror(errno));
        goto err;
    }
    if(ftruncate(shmfd, sizeof(uint_8)*OVERALL_MEM) < 0) {
        esyslog("cBitStreamOut::Start() ftruncate (%d) failed: %s\n",
                 sizeof(uint_8)*OVERALL_MEM, strerror(errno));
        goto err;
    }

    setup.buf = (uint_8*)mmap(NULL, sizeof(uint_8)*OVERALL_MEM,
                              PROT_READ|PROT_WRITE,
                              MAP_PRIVATE|MAP_NORESERVE|MAP_LOCKED,
                              shmfd, 0);

    if (setup.buf == MAP_FAILED) {
        esyslog("cBitStreamOut::Start() mmap failed: %s\n", strerror(errno));
        goto err;
    }

    if(mlock(setup.buf, sizeof(uint_8)*OVERALL_MEM) < 0)
        dsyslog("cBitStreamOut::Start() mlock failed: %s\n", strerror(errno));
+++

maybe this should be used for any ringbuffers within vdr ?

if you say this is true, i will do a little easy alloc/free wrapping
for this purpose ..


your opinion ?

cheers, sven

- -- 
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