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Full Discussion: how to find out free memory?
Operating Systems Linux Red Hat how to find out free memory? Post 302363597 by jim mcnamara on Tuesday 20th of October 2009 05:21:49 PM
Old 10-20-2009
From the free man page:
Quote:
The -o switch disables the display of a "buffer adjusted" line. If the -o option is not specified, free subtracts buffer memory from the used memory and adds it to the free memory reported.
This answers your question - free thinks buffer memory is really free memory. Which is what I explained above.

Free means it is not absolutely required by an active process. The kernel uses 'extra' memory to facilitate operations - like I/O. Those are the buffers in question. It is kind of like luxury uptake of an unrequired resource, if that makes more sense to you.

What are you trying to figure out?
 

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t_free(3)						     Library Functions Manual							 t_free(3)

NAME
t_free() - free a library structure SYNOPSIS
DESCRIPTION
The function frees memory previously allocated by This function will free memory for the specified structure and will also free memory for buffers referenced by the structure. The argument ptr points to one of the seven structure types described for struct_type identifies the type of that structure which must be one of the following: T_BIND struct t_bind T_CALL struct t_call T_OPTMGMT struct t_optmgmt T_DIS struct t_discon T_UNITDATA struct t_unitdata T_UDERROR struct t_uderr T_INFO struct t_info where each of these structures is used as an argument to one or more transport functions. will check the addr, opt, and udata fields of the given structure (as appropriate) and free the buffers pointed to by the buf field of the structure. If buf is a null pointer, will not attempt to free memory. After all buffers are freed, will free the memory associated with the structure pointed to by ptr. Undefined results will occur if ptr or any of the buf pointers points to a block of memory that was not previously allocated by Valid States All - apart from T_UNINIT Fork Safety is not fork-safe. RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned, and is set to indicate the error. ERRORS
On failure, is set to the following: [TSYSERR] A system error has occurred during execution of this function. [TNOSTRUCTYPE] Unsupported struct_type requested. [TPROTO] (XTI only) This error indicates that a communication problem has been detected between XTI and the transport provider for which there is no suitable XTI ( SEE ALSO
t_alloc(3), thread_safety(5). STANDARDS CONFORMANCE
t_free(3)
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