Messages in this thread Patch in this message | | | Date | Mon, 9 Aug 2004 01:49:14 -0700 | From | William Lee Irwin III <> | Subject | Re: 2.6.8-rc3-mm2 |
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On Sun, Aug 08, 2004 at 03:29:36PM -0700, Andrew Morton wrote: > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.8-rc3/2.6.8-rc3-mm2/ > - Added a little patch to the CPU scheduler which disables its array > switching. [...]
During the kernel summit, some discussion was had about the support requirements for a userspace program loader that loads executables into hugetlb on behalf of a major application (Oracle). In order to support this in a robust fashion, the cleanup of the hugetlb must be robust in the presence of disorderly termination of the programs (e.g. kill -9). Hence, the cleanup semantics are those of System V shared memory, but Linux' System V shared memory needs one critical extension for this use: executability.
The following microscopic patch enables this major application to provide robust hugetlb cleanup.
Index: premm2-2.6.8-rc3/include/linux/shm.h =================================================================== --- premm2-2.6.8-rc3.orig/include/linux/shm.h 2004-08-07 02:17:59.231816608 -0700 +++ premm2-2.6.8-rc3/include/linux/shm.h 2004-08-07 03:46:10.163472736 -0700 @@ -44,6 +44,7 @@ #define SHM_RDONLY 010000 /* read-only access */ #define SHM_RND 020000 /* round attach address to SHMLBA boundary */ #define SHM_REMAP 040000 /* take-over region on attach */ +#define SHM_EXEC 0100000 /* execution access */ /* super user shmctl commands */ #define SHM_LOCK 11 Index: premm2-2.6.8-rc3/ipc/shm.c =================================================================== --- premm2-2.6.8-rc3.orig/ipc/shm.c 2004-08-07 02:17:59.395791680 -0700 +++ premm2-2.6.8-rc3/ipc/shm.c 2004-08-07 02:58:23.613254608 -0700 @@ -688,6 +688,10 @@ o_flags = O_RDWR; acc_mode = S_IRUGO | S_IWUGO; } + if (shmflg & SHM_EXEC) { + prot |= PROT_EXEC; + acc_mode |= S_IXUGO; + } /* * We cannot rely on the fs check since SYSV IPC does have an - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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